For whether blast doors are commander controlled or person controlled.... hey thats a really good question! Perhaps there should be a new thread about it maybe?
Ah! Awesome idea! Make people able to open blast doors, but they close a few seconds after, and only people on that team or the commander can reopen them from the inside or outside. That way one guy cant screw it up for everyone by opening it, because it would close a few seconds later, stopping any enemy advance. Only the commander could open doors so that they would be left open.
Id say have the "home" team (for example Imperials in a star destroyer) being the only ones able to open and close blast doors.
However, if you shoot the control panel while the things opening or closing, its stuck that way, until somebody repairs the panel.
Means if you have some trigger happy rebel, he might blow up the control panel when the blast door is closed, sealing the rebels outside.
But it also means that if you have a smart rebel, he will shoot it when an imperial is opening it, so it remains stuck at least partially open.
Seems like an awesome idea... it might not be very fun being stuck on the outside of a blast door in an imperial ship, but it is how they would stop boarders, and there are ways to get around it.
Just wait for an unsuspecting stormtrooper to open the door, then shoot its control panel (which should be on both sides of the door, but only one side can open/close them). Thus it is stuck partially open, unless the imperials hold you off long enough to repair the panel and shut the door again.