Rules clarifications

In minimum distance and Collisions it states one movement distance to keep ships apart, is that still 5cms?
Guns with the rapid fire rule. The question is can a ship with multiple weapon systems fire its non rapid fire systems in direct activation and then fire its rapid fire guns in the remaining actions phase?
Can you activate one ship in a squadron for an action and then subsequently activate the rest of the squadron for the same activation and keep the squadron together, providing squadron cohesion is not lost? I'm thinking something along the lines of one ship out of the squadron is not ranged in but the other 2+ ships and want to get the one ship ranged in with having to fire the others.

I think the answer is Yes to all your questions there. Except the last one I think. I don't think I fulley understand the last question, but if you activate, all ships activate. So if one ship is not ranged in and you activate for a gunnery activation, all ships must shoot for the turn (except rapid fire weapons if you so choose)

Got it. If you activate a squadron or ship in a squadrong the whole squadron must respect the order. Thanks