As much as I appreciate being able to take care of something around the house (or take a poop) and not be kicked from the server, there are times when something comes up and I get distracted and forget I was in game, only to discover HOURS later that I've been in spec the whole time, taking up a server slot. Kinda makes me feel like an asshole.
It would be nice if there was still an auto-kick, albeit with a longer timeout than non-donors. Like an hour? Or 30 minutes even? There's really no reason to be completely idle for that long, donor or not.
On the flipside, it would be nice if the move-to-spectator timeout was a tad bit longer for donors. 60 seconds is pushing it if I really have to pee. 75-90 seconds would be a lot better.
Anyway there's my 2c.