I would like to see some kind of tripmines in the game. This might require a special tool, similar to a mining or harvesting attachment, called a minelayer.

Typical tripmines would require some time to set up, and then they will explode if someone drives over them. They would decay and disappear after some time if not tripped. Tripmines could have varying effects: pure damage, Ewar type effects like slow, blind, etc.

Caltrops could be scattered on the ground and have Ewar effects due to the chemicals infused in them. They also would require the minelayer attachment.

I would also propose that industrial robots could lay mines.