Maybe a button as an alternate for ctrl+/? Doesn't seem to work with a non-US (Norwegian) keyboard layout? (Iceweasel/Firefixo 23.0 Debian Wheezy - note also noscript and vimperator -- which can make keyboard navigation tricky).

Doesn't seem to work in chromium (Chromium 29.0.1547.57 Debian 7.1) either, with Norwegian keyboard layout.

IMHO,

-I'd love if there is a button causing the pad to remain as a separate, relatively smaller pop-up ish window.

-Share to email address option.

-Ability to toggle "always on top" maybe?

All I could think of right now.