I can just imagine some backward planet with primitives worshipping a battered old Gonk Droid on a pedestal. ;-)
I too would like to see more interaction with droids for the reasons you mentioned. Like getting an R2 unit to jack in and open a blast door in your way.
Yeah, I have to agree about troopers showing a diversity of armour/clothing - and even tactics - depending on the environment. The same goes for any of the characters, though.
It might also be cool if you could catch some stormies in their barracks, with only half their armour on...or minus a helmet or something.