subplots adjust

I am writing to ask about the subplots adjust widget. I think the gui would be
better implimented by each backend using the native widgets rather than by
the existing set of backend-neutral sliders, which are somewhat unbecoming.
The proposed backend-specific widgets could call the generic subplot resize
routines, and really shouldn't be that difficult to impliment. Also, I was
thinking that subplot_adjust should be selectable from a standard
dropdown "File, Edit, View..." menubar instead of on the main toolbar. The
save button could also be moved to the drop down menu bar.