Hey Cheech and User12996 ,
Thank you for sharing your insights 
I like the idea of closing account transfer to some servers, we will definitely need to implement this feature in some servers after launching a new app to make it easier for new players to get started.
Account transfer isn't essentially bad, you already can't transfer your account to a server if it will end up in top 50 total score but there still is a room for improvement, blocking transfers to a server for some time after its start is a good thing although I think that the period you mentioned is a bit too short because by the end of it it's already impossible for many accounts to transfer to this new world because the will end up in the top 50.
But as you said it's too early to draw conclusions and we need to wait and see, it's a natural part of the game, or any software, development cycle.
I'll be discussing account transfer later in relation to other problems because transferring 1 account to another world doesn't cause a problem on its own, I can't elaborate without making this post too lengthy so let's keep it for later.
About Ambrosia prices, it's natural to have price differences because what is considered affordable or even cheap for some one living in San Francisco or London could be substantially expensive for someone in a low cost of living county, like South East Asia countries for example, for them you are the one getting cheap Ambrosia actually.
So you need to use different prices or you will end up losing potential revenue, this is the case even when selling ceiling fans in different countries.
But are you sure guys there's any price difference? I read about this a couple of times before but I've just checked the price in the EN server/community, 2 other servers with 2 different languages and one of the international Pangaia worlds as well and I found the Ambrosia price to be exactly the same. e.g. 1700 Ambrosia for $100 in all of them.
So it appears to me that the price difference, if there's indeed a price difference, is not based on the community, so what is it based on? IP address? Because, if so, it's easily manipulated and they need to change it or the company might be losing money already, let alone affecting players' experience.
From a game dev POV I'm equally concerned about losing revenue and annoying players.
Could someone from Gameforge please tell us if there are any price differences? badidol ? We need to know more about this before we can discuss it any further. Thanks!
That said I need to mention it's not likely going to be a top priority to fix right now unless it's influencing other problems because, although it feels unfair, it's not breaking the game or causing immediate military advantage to for one side over the other except in some extreme cases, let me know if I'm wrong.
Now for the remaining issues you have mentioned, I have encountered pretty much all of them.
I really like something you did here which is differentiating between different types of multiple accounts, because multiple accounts term refers to one player owning more than one account in the same game world.
We have bots which, as you mentioned, are further divided into several types depending of their purpose but they generally have low points and limited fighting capabilities.
We also have the actual multis which can be very close to there owners main account, some are legal multis with IP sharing which pretty much are unable to help each other thus having low potential for causing problems, and some are illegal multis which are the ones causing problems.
I will be surely discussing multis as a top priority issue.
Unit upgrades: unit upgrades are not actually as bad as you think, there's a somewhat evil intention behind them but I won't upset the devs by discussing it now.
Other than that the upgrades also aim to fix a crucial design problem which is low demand on crystal glass which in turn causes less demand on city spots on crystal islands and more demand on marble islands, and if a player opts to be more balanced and have more crystal towns anyway he will end up with a ton of unneeded crystal, now that's a problem in game economy which has two fixes:
a) Cutting the source. i.e. making you get fewer resources.
In Ikariam that means making fewer crystal islands which will obviously require rebuilding the islands world. Why? Because simply lowering the amount of produced crystal per worker won't be enough and players like new features more than getting resources income lowered.
b) Creating a sink. i.e. something that will drain the extra resources which is exactly what they did but they did NOT design and test it properly.
Now if you need some advice regarding upgrades then just don't invest in obsolete units like archers or slingers, don't invest in upgrading the defense of ranged/second-line units and keep in mind that a player will need a large difference in upgrade levels to have an observable advantage over you, at least it is the case for many unit types.
Banks: there's a lot of ideas we can implement to end them, in fact I think the first thing I'll be discussing in details is going to be banks, especially that User mentioned they are already discussing it on Discord.
Leniency do exist, in some servers more than others, I'll even need to mention an incident highlighting this:
Several years ago there was a GO on my world, luckily retired now :D, who had a large area, well OVER 20 ISLANDS, covered with piracy bots, each is a small 3 cities account doing one thing only: producing piracy points. I pirated one of them once and I got threatened by him "Don't do this again or we will have a problem".
So yes there is leniency and there's also a great deal of GO corruption in some communities and we can't complain or we will get banned for good, I'm actually at a serious risk of getting unfairly banned from the forums for discussing a similar issue a few days ago.
Locking and bleeding: A long time ago there was a rule limiting this; you would get banned for pillaging a smaller, total points, player more than 5 times in a 24 hour period. It had some gray area though as some said it applies to each city individually so you can attack each city of that player 5 times.
Anyway, as the player base deteriorated this rule got removed to enhance engagement, there were not enough accounts to fight as some would argue.
This rule could be applied again for new servers where alliances are still forming and unable to defend its members effectively, for older servers I don't know if it's a good idea.
Idleness: if we fix multis and banks there's going to be a large amount of action going on, we also have events as a possible remedy to this issue I happen to have some grand ideas for events like a "Persian" event maybe? 
You know, Persia was a great adversary of Greece trying to invade it several times including the one with the 300 Spartans, so why not?
Finally about the scripting part, lately I have got my attention drawn to the fact that I some times repeat some tasks in a regular timely manner and it could be mistaken for scripting so it, unfortunately, is a thing to keep in mind when playing any game, I would suggest contacting support and reasoning with them to get your ban lifted.