I'm using Sheldon's logic on this one.

Suicide hub - "Despite the silly name, this is no more dangerous than using a freewheel, as long as you keep front and rear hand brakes installed."

I can't find it right now, but the scenario he used to justify this opinion is something like: If a truck pulls out in front of you, you might give the front brake a hard pull - causing cable failure. At this point you back pedal hard - causing the cog to unscrew. Now, you have zero means of stopping.

I'm sure this is an unlikely scenario, but I'm all for redundancy in safety systems. I think it was drilled into me through setting up anchors for rock climbing.

EDIT: My original 2 brake comment was made without reading that the OP now has a proper hub. So, nevermind.