regarding the brake issue, the ones I've flown had the brake lever, when fully engaged and locked, almost pointing down just in front of your face so I really don't see the point of some aditional gard.
Never saw one, neither on mil, nor civie machines...
regarding the fuel pump, 20 sec is taken so that fuel is interduced to FCU, usually it takes less time, and if you over do it, she simply drops surplus fuel (marking her teritory) and there won't be hot start. After start, pump is left ON, but she can fly and do her thing without it, no mather what altitude, attitude,...
also heard that thing about CWP and engine running, tryed it lots of times on ground and in the air, nothing happened, aldough trough my flying, I've noticed 3 or 4 different types of CWPs on Gazelles, maybe there is one faulty series?