I want to make a fun (read: stupid) custom map where players just lob grenades at one another. There was a custom map like this for CS that had like 100 HE grenades placed on the ground for players to pick up. Is that possible in DoD? If not, is it at least possible to make it so when a player enters a special "supply" zone on the map, they are instantly given one or more grenades in their inventory?

You can place weapon_stickgrenade (german) or weapon_handgrenade (american) entities to put nades in a map. Players can pick up about 5 i think. Either team can pick up either type of grenade and they respawn after a short amount of time.