Weapons from crates last only one turn (or more)
A reverse of weapon-delay: a weapon will only stay in your inventory for x-amount of turns. Players might set it to 1 turn for a Shopper scheme, so that you have to use that weapon on that turn or not at all. No saving the banana for a good pile, or using an "easier" weapon this turn because your opponent is in too good of a hiding spot. Other schemes like T17 might set the weapon dissolve to something like 4 or 5 turns. A Hysteria with crate drops might have it set to 2 turns so they have to use the weapon on their next turn or give it up.
Of course, Sudden Death would disable this feature in the same way it stop crates from dropping, so that whatever weapons you have (or collect after SD) you get to keep.
Not sure if this should be set in the Weapon settings area for individual weapons, or have it set in the Options area where it would apply to anything collected from a weapon or even utility crate. Not the health crate, because it would be a little funny if the health disappeared from your worm after your turn ends :D