[cowmeat]

Concerning the brake booster while the engine is off:

Although you'll only get one or two pumps of the brake pedal before the booster freezes up, you can make the pumps last as long as you want. I've learned to apply the brake gently with one long gentle pump while I EOC up to a long light, and then instead of pumping it again, just apply more pressure. I've never ran out of pedal so far using that technique.
I also brake early and time the lights, so most of the time I'm able to bump start instead of actually stopping.
FYI: Keying on while the booster is frozen up will immediately drop the brake pedal to the floor, so you'll need one pump to get brake pedal back! Don't wait until the last second to key back on if the booster freezes, do it early.