Hello, no there's no wish list (for users) for RT. There's also no direction where RT is going (on behalf of the devs) as far as I'm aware of. Local editing is not supported in RT. For now that is, perhaps one day that might change. Do local editing as a post-process job in GIMP, for example. RT has a button to send a processed raw file directly to GIMP.
You can always suggest to implement new features, use github for that.