Taking this opportunity, I'll make an announcement. Work on the patch, which no one was hoping for anymore, has finally moved forward. I fixed about 15 bugs and implemented some requested features, added a couple of convenient features like buying all items or selling all resources with a single click, etc. The work is still ongoing, but I think I'll release it in about a month.
update: I've re-uploaded the mod. I forgot to specify the address for the tooltip for the "OK" button again, and I fixed the scrollbar. I hope everything is okay.
update2: It seems the large window is too large for messages. I made it as close as possible to what's in the map.