[Hellstrom]

Caltrops as they are do cause damage like getting asbestos under the skin. :P Also if pcs have them NPcs will too.

I think LLS's point was that too many monsters can simply ignore caltrops because of their damage resists. It would be nice if caltrops were a bit more useful. Allowing them to be poisoned might be one way. Another way might be to have them give a temporary Slow effect if they do damage (it's hard to run with a spike in your foot).

So people will need to stock up on more potions and bandages if this goes into effect.

People already need to stock up on those things. I can't imagine some changes to caltrops changing things too much for PCs. On the other hand, making some changes to poisons might encourage more people to carry some Neutralize Poison potions.

Another :idea: what about allowing a very hard Heal DC to remove the poison or to stop the poison's secondary effect. Maybe against the poison's DC?

Sorry if I'm adding too much work for you T :)