Is there a way to fetch mail from only one server

Good evening,

I've got quite a number of remote email servers set, but sometimes,  
such as when adding a new one or testing because of problems with one,  
I need to repeatedly try fetching.  The is currently a nuisance,  
because Balsa has to cycle through the entire list every time, and even  
worse, I currently have one server (Yahoo, of course) which times out  
more often than not, at 30 seconds a pop (no pun intended).

If this is not currently possible, what is the right place to record it  
as a wishlist?

Thanks.

Jack