Welcome to releases! I think this mod is great at what it does, but I am often confused when a mod disables a core part of its functionality and it needs to be enabled. I imagine a lot of players like myself would expect input_self to be on by default. I also think it would be a great addition if the Custom Button inputs and maybe even Toss Flag were there as a (default off) toggle, for the more complex character mods that use them. Still, good stuff!
I was also considering the addition of manual positioning of the input viewer for players who prefer a better spot for it to sit at. This is a small detail, but I know there are people out there who love to customize their HUD.