Add more customisable themes.
By this i mean, Example let people choose a background image for the app itself, and also an option for users to customise the overlay to their liking (position of certain mods, different fonts, etc).
I honestly don't know how hard or easy this would be to implement or if it is a thing already (I've been using WeMod/Wand for quite some time and never saw this), this would be great for users who want an experience that feels closer to them (i know it sounds weird).
Also i don't know if this has already been talked about before, but if it has, then my bad