You already requested ladders, water and swimming.
I could maybe add escalators by adding a modifier that moves you in a certain direction.
Rain and snow can already be done with particles.
You can already use multiple sprites for enemies and decorations.
Zoom can already be done with the 'ZOOM' fsm action.
You can make destroyable 3d decorations.
You can do your proposed vehicle solution with a weapon FSM and the 'PLAYERSPEED' action
If you haven't already read the FSM section of the manual, I would highly encourage you to check it out.