Suh-weeeet. Rated 5 out of 5 stars
This is a great extension for any user, but for us gmail/google-mail users, it is REQUIRED!!
TB already has message shortcuts A=archive and S=add-a-star, so I made D=Trash (i.e., move to gmail's Trash folder) because of course the delete key simply acts as an archive key. And it's nice to have all 3 keys in a row! (Those are straight key presses, no Alt, Ctrl, etc.)
I also have 3 special folders (the GTD productivity concepts), so I mapped U, I, and O to moves to those 3 folders. I used those 3 because they are the only 3 letter-keys in a row that are not already used by TB.
Thank you, thank you!!