When the brake breaks

I'm still buying parts for the bike that isn't here yet. First it was Ultegra pedals, then the new chain ring. Now it's this Paul e-lever thingy. As you may know, I can't grip with my left hand. I've been using just the front brake for forever, but a recent conversation got me worried. What if that front brake has a problem when I'm zooming down Mt. Diablo? I'd be toast. So I'm going to add this on the right side to control the back brake, and I'll use it only if disaster strikes.
UPDATE: UPS Tracking says bike delivery is schedule for Monday!
Days since bike order: 5