I’m glad you like it! I’m a huge fan, but I guess that’s obvious by now… 
The best way to get suggestions to the Goodbudget team is outlined here. They have a running list of the things we’ve requested, and there’s a roadmap here that tells you what’s in the pipeline.
I’ve also noted and sent along a couple of unusual behaviors; I just FINALLY upgraded to 11.7.7 (from Mojave!) so I don’t know if they were version specific, and they’re good about acknowledging even if it’s not set up for an immediate fix.
Aaaaannndd…I don’t think I’ve ever seen Uncategorized…where do you see it? Are they maybe transactions you’ve imported without assigning an envelope? You stumped me… @Alex or @karisa? Uncategorized?