I vote to add these items, the proper use of explosives is a time tested way any action movie hero kills large numbers of enemies in any good action movie. ^,.,^
All though, nerfing those little sticks of doom would be in order.
Oh, and speaking of mines, i'm all for adding land mines, which already exist, in to the crafting tree, with correct changes to the NCR guard AI of course.
-Ulrek-