Is there an overview somewhere of the timed quests? The main thing I worry about is if NPCs leave. Think Edwin and Korgan should be safe now, but I worry Haer-Dalis may bugger off unless I go back to the place he wants to go (which I know will have dire consequences in itself).

I do not know of such a list. But to my recollection, your NPC quests in BG2 will not have surprise deadlines on them, so you should not need to worry about a situation like you would have in BG1 if you did not help Minsc find Dynaheir quickly enough. If you are on a deadline in BG2, it should be spelled out when you get the quest and your journal entry for it.

That is re-assuring; I don't want to lose any in my party due to a time limit I don't know about. Hopefully all goes well, as we have headed out from the city now.

I'm not so sure about that. I believe there are timers on some NPC quests, but they do keep reminding you about it when this is the case. It might be more relaxed than BG1 though, you should have a few days between reminders. And if they leave, I think you can usually find them at wherever they wanted to go and pick them up again. (Nalia, for example)

I worried about the same thing during my play, but in retrospect, I think better to just go with the flow. It just helps to make your companions seem like real people when they do what they want. ;)

I can think of a few on which there are timers, but not timers in the sense of a hidden deadline (as was Minsc's quest involving Dynaheir in BG1). I only recall one NPC who left the party- but there is nothing that can prevent that beforehand, and there is nothing that can be done other than to wait for enough time to pass that the next sequence in the quest happens.

Yeah, they'll complain (sometimes twice) if you're not moving on their quest fast enough.