All items that can respawn in DM can be made to respawn in SP with the “ritem” key. Set this to 1 to enable this behaviour.
If the “respawndelay” key is set, will override the default respawn time to whatever is set.
If the “respawncount” key is set, this item will only respawn that many times, and will then remove itself after it has done so.
This is useful to set a cap on the amount of times it can be picked up. Very nice when you have an arena fight and you don’t want to clutter the whole area up with items, or to make a healing pool that can be eventually depleted.