What do you have set in your boot.cfg? Just curious. I've got one machine running a very weird resolution and haven't had any problem having the resolution change in AM, though many of the layouts have their widths and heights manually set which causes awful font stretching as well as asset stretching. For myself I solved this by making a scaling module so its easier to make layouts that work on multiple resolutions. Its not a drop-in solution for existing layouts though.
As for development, Oomek has a fork where he is working on a bunch of stuff. Check out the Attractmode discord if you want to read up a bit on what he is working on. Interesting stuff.
https://discord.gg/86bB9dDIf you want to post your modified layout I can do a quick check and see if I can throw my scaling stuff at it and see if it makes a difference