Hi!
It saves something from being reloaded when tables/db list get changed. But I'm not sure whether it is worth of it.
I'm for merging query frame with left.
Merging the frames will destroy the query's window functionality to let it stay open and handle your click paths.
I'm -10 ;) for merging, and sorry for writing so short - have no time. :(
Regards, Garvin.