- You could add a few choking points, like a bunch of doors in a hallway through which you need to go, but you'll have to destroy them.
- A gate opened by a winch, and you need to get to the winch in order to open the gate and proceed.
- A wall you need to blow up with a sapper's explosives?
- A small maze with sudden drops at dead ends or something.
Can't think of more atm, I might add some other stuff later