It would very nice to have scheduling (schedules, timers, away mode) across grouped devices. For example, I have a number of switches controlling outside lights. Rather than needing to program each...

How about creating a garage door opener?

It would be nice to have a single-bin switch that contains 2 half-size switches in one, preferably 3-way.

@cg_45 Here, here! A single switch for variable fan speed and dimmable lights. I've got a number of them in my house that I am unable to replace unless I go with a different brand.