The Mac version requires the mouse to work as tabbing through controls isn't possible for some reason.

[DrewNaylor]

This is possible on both the Windows and Web versions by default with no changes, but maybe Cocoa requires adding stuff for keyboard commands such as command+v and tab to work. Also there's no select all for the video URL textbox, so if something other than a video URL is pasted in there, you'll have to manually remove it, or click on part of the edge of the textbox, hit delete, and it should remove all of it at once.