Hi there!
I'm very interested in why you think that the current support isn't enough, as I'd like to support low res as much as possible. In the v2.0 update you can set the canvas size (in the v2.0.0.5 you can set the canvas size for blank projects so you don't have to redefine them every time). If you need exactly 16x16, 32x32 or such without trimming, you can deselect the trim option when rendering. Loops should work for any length, and If it doesn't a warning popup should appear with a "Fix It" button, this might not work on edge cases but If that's the case let me know so I can fix it.
What changes do you think would allow you to have a better use of the app? If you want to have a more direct conversation about this, we are on Discord: https://discord.gg/azdqRf8