I had a bit of idea on how this could work.
Pressing a specific key binding can open a brick menu (seen by the wrench), but does not affect any brick. It instead, binds it to the actual tool gun. Upon shooting a brick, it modifies it with the settings currently on the gun.
So, if the toolgun has a brick name of "wow", the item chosen are Guns Akimbo facing up, and an event that kills you upon activation is set, shooting it at any brick will automatically set it to those specific settings.
I'm not sure if that's done yet or not.