[MlMt] Threaded view: new messages hidden in collapsed threads

[John Cooper]

Are there any settings, hidden or otherwise, that show new received 
replies in expanded threads? I find threaded view indispensible, but 
when new messages come in, they're hidden in collapsed threads. And if 
there was no thread before (that is, if only the initial message 
previously existed), the new thread is always collapsed. I use 
option-right arrow to open the threads many times a day. More if I 
forget the option key. I think I'm about to wear it out.