The ability to put layouts in folders is great (Miscellaneous things, first dotpoint). It is making it much easier to organise my ever-growing layouts. But the only way that I know to add folders is to go to the Layouts directory first and create whatever folders I need.
It would be very nice if the Prefs LayoutSave screen had a New Folder icon, with accelerator key, so that we could create new folders as we go. This is a standard feature on the normal Windows screens for manipulating files.