Featurerequest: save sketchbook folders

[willie68]

I have many different projects with many different targets (Tinies, Uno, Mega...) and different libraries, which sometimes conflicts.
So i have different sketchbook folders.
So it would be nice to have the sketchbook folder input box as a combobox, where i can select previous sketchbook folders.
E.g. when switching it would be nice, that all parameters are switched, too.
e.g. the board is not refreshed to the new folder. I can see the hardware definitions of the former sketchbook.
Sorry for my poor English