What exactly can one do with the Craft Trap skill?

Can you:

* manufacture locks? * make copies of keys? * craft poisons? * create simple non-magical tools? * repair siege equipment?

What else can I do with this skill?

Craft Trap is generally considered the placeholder skill for mechanical knowledge.

I wager with a DM's help you can make up a makeshift trap out of nothing, or string and some nearby boulders on a cliff.