As Sweden I made peace with Russia and agreed to pay them 1k for 10 turns. However, after, the only way to figure out that I had an agreement was to check my "other" income, which went down to 2k for the duration. The diplomacy screen was absolutely no help, it didn't think that any agreement had been made.

It would be nice to have a breakdown of your "other" income. I'd like to know how much my various protectorates give me.

Possibly not a bug, but maybe pirates should build a few more defensive units and maybe even take weakly defended nearby provinces... but that would need the complete lack of AI invasions to be fixed - not on your list?

You've taken on a major undertaking, thank you!