Custom weapons: press a button overlay to switch between weapons. Certain weapons (like a quantum portal) would have abilities like being able to teleport places with another button overlay (also with the quantum portal).
Ideas for custom weapons:
Epic Quantum Portal: Can press a game overlay that opens up to a pop-up menu to teleport to places you have already been to.
Legendary P.M.L: Can activate an ability to rejuvenate 20 HP/Second for 5 seconds. Has a 30 second cooldown.
Legendary Pickaxe: Can break cracked walls (Dynamic ruby with a grey cracked barrier over it).
Legendary Slingshot: Can Random Crit, meaning that there is a 1% percent chance every second to get a 10x damage boost for 1.5 seconds.