Larger ammo pickups for Kustam? I played through the wad Diabolus Ex (which is usually pretty hard,) with him and I was drowning in ammo, I don't think I ever switched back to the staff one I first switched to the gun actually.
It varies from mapset to mapset, I've played through maps that provide mainly bullet tier ammo and I found Kustam was ammo starved really hard. Such is the nature of making all ammo types pile into one, as well as me trying to make sure this gameplay mod works with as many mapsets as possible