Question is whether there might be some possibility of having a setting\profile regarding the priority telephony should be getting. That way someone might be able to decide at different times what is more important. In windows, FWIW, there was a setting "boost for performance" or "boost for apperance" (or something like that).
I would love to have the ability to decide what priority my phone gets at different times. If i'm only listening to music, but left my browser on so I wouldn't have to look for the URL again later, I would want telephone to have high priority. Or if I was waiting for an important call - I could boost responsiveness to the phone. But if I was just working on something important like an install of some new app I didn't want to get screwed up - I would say, let whomever, call again later.
Or maybe, there could be some sort of "responsivity notification" that tells you - how responsive your phone would be given all the things that are open - so you could see - hey my phone is gonna miss calls unless I close things down.
I don't know if this is possible - but just a constructive thought rather than say "well, what did you a get an n900 for - not for the phone..." .