hm. It would be nice if technology research were saved, so you didn't have to re-wait for it to go when you switched for a while. It would make more sense, too, because I mean, switching to something else doesn't lose the research you've already done.
That way if there's 25 minutes left on something, and I want to go to bed, i can put it on something else overnight, then switch to the 25 minute one in the morning.
Queueing technologies would be nice also.