SPECIALPICKUP flag

[GhostKillahZero]

This is similar to SPECTRAL flag whereas things can only pickup items that also has SPECIALPICKPUP flag set.

Edit: I realized there was a typo, sorry about it.

[Xaser]

This is the sort of thing you can DIY in ZScript nowadays. Inventory items provide a CanPickup virtual function that can be overridden with custom logic (simply return true if the item is pickuppable, false if not).

A super-quick how-to: create a custom property in the actor that's doing the pickupping, check for it in CanPickup, and you're in business.