I like the idea of mech crews doing special things, so I have to ask:
What about mech crew feats?
Like, say, a crew of a Colossal III mech has been together for a good while and work well together, enabling them to reload faster or coax more performance from their mech (like more speed, or cut a tighter turn) or gain bonuses against invading boarders?
Feats allow you to customize your performance in battle, and open up new tactical options and tricks, so it'd be cool if you could apply the same thing to mechs, and make the crew have an impact on the performance of a mech.
I like this idea. I'm going to have to strongly support it.