Hi! Just made this account to thank you, as this is an extremely helpful script - wish I knew something like this existed earlier.
I don't know if this is a thing you can already do or easily add (if you still intend on adding more features), but personally, I would find a marquee selection tool button shortcut to be wholly helpful. At least for me, it'll encompass pretty much all the tools I'll ever need in a drawing session.
Thanks!