Keyboard shortcut: Cmd+Enter to post?

It would be awesome if I could tab Cmd+Enter (on my Mac) to "commit" the editor, that is, to create the post or to send off the reply I'm currently editing.
This shortcut is used in most of our other web-based apps, so it would be great to get to TY.
Today, we have to hit Tab, then Enter, which feels less "native".