olive token
It would be cool to have material types for floors. You would be able to blow through a wood floor in a house to generate a new route, but a concrete floor in a building would take a few c4 to get completely through.
My second suggestion is for general map mobility. Players could use an alternate squad point buildable ladder that can be made of wood or rope. This would allow for some vertical mobility for classes without access to grappling hooks.
My last suggestion is for a buildable climbing rope mesh limited to supports only, this would function similarly to the grappling hook now.