SyncToy feature req: Resizable select subfolders dialog

Hi,

First of all, thanks for making such a great little utility. I love it!

I just have a little gripe with its UI. The Select Subfolders dialog is
non-resizable, which forces me to repeatedly scroll left and right to read
the full pathnames when in a deep hierarchy.

I'd think it shouldn't take too much effort to make the dialog resizable,
and would love to see this in the next version. Thanks!