Yeap, i *had* similar concerns, but got over em. They're certainly valid ones though.
As for using the "Normally Open" types, it's already supported by the kit, you just need to swap a link/jumper around. The problem is you end up with significantly more solenoid wear so it's a toss up.
Probably not, because these are the first things to go if you want to get the most out of the boost increase the IEBC is providing.
If you're running some big setup capable of huge boost i might be worried, but personally I just have a stock RB20 turbo atm, so my turbine wheel is likely to fly apart before ramming 20psi of superheated air down the engine's throat!