Process for change/feature proposals?

What is the accepted way to submit change/feature proposals for either SL, Daedalus, or both? I’ve been exploring integrating TOTP into Daedalus, but want to both make sure I’m not going to duplicate work with anyone else who may be doing the same thing, and make sure I don’t miss anything with making updates to the wallet backend. Plus I’ve seen whispers in the code of a “new wallet” backend and don’t want to wastefully make changes to code that may already be on its way out.

open an issue on proper repository, I would say.