suggestion about unsubscribing from threads

Periodically, I like to unsubscribe from threads that seem to have run their course or that don't interest me anymore. Call me anal, but I don't like a suscription list cluttered with old threads. However, it's so tedious and time consuming to unsubscribe from threads one at a time. Would it be possible to set up our list of subscribed threads like our list of private messages, with a little box that you could check if you want to unsubscribe, so you could unsubscribe from several threads at once? I'm not trying to complain. This place is great! Thanks.