@Vennala The Great Migration changed a lot of circumstances.
The KP contributions less than 5 KP are the ones that irritate me. It just seems like someone is trying to get something for nothing. We handle that "in house" by letting other fellowship members know there are those type of donations.
I see you mentioned an "allotted amount", which I assume you have a KP swap. I do not have one in my fellowship, so I may be lacking knowledge in this area, but I don't see why that is a problem if the donator is giving you 10 or more KP.
There are several reasons why they may be donating to your AWs. They may need the shards from them to build or upgrade AW in their own city. If they are at the top of their fellowship, or no one else has that AW in their fellowship, this could be the only way they have to speed the process.
You are free to handle this issue in whatever way you choose but know that donations of 10 KP or more are looked on favorably by many fellowships and can be a bridge to making new friendships or even gaining new members to the fellowship.
If you want to donate at least 10 KP to any wonder of mine, please do so. I will probably return the favor.
Forging new friendships costs nothing and can only benefit all those involved. You may even find your trades are favored by that person.
The button idea could be handy, but I don't know if the issue is that serious to cause a coding change.