You can use gorilla arms to open doors, well, only some and there's a strength requirement still. You can also tear off turrets if you have the strength for it.
As for stability, I've got about ~150 hours and only crashed once.

I also tried fighting my way out of the customs checkpoint at max level. They still cut me down. I'll remote hack and disable the turrets. I've tried bolting through on a motorcycle, but there's a barrier on the other side that will throw you off the bike.