I'm all for this. ATM, demo expert has 2 grenades and dynamite. In terms of battle, dynamite is basically useless since you can't throw it (correct me if i'm wrong). It is honestly only good for suicide bombing or reverse pickpocketing (which is extremely hard, usually requires a stationary target, and i'm not even sure if that works). Bipboy's suggestions would work very well for demo expert. They could be spread out among the three levels once Demo 3 is implemented, so you can craft more than grenades initially.
With this another item, the metal detector, could be added as a generic crafting recipe with a high science requirement. When in either hand, some traps (maybe not all types) would be shown in an immediate vicinity. When disarming these traps, there's a very very small % chance (depending on your traps skill/LK or some other stat) that you recover the entire trap.
The metal detector could also then be used in random encounter maps to find other things, like junk, EP, or a few caps, that could be dug up with a shovel (making the shovel more useful). Or even in some quests where the NPC tells you to go find x item on a very large spawned map.