Sprays should show the name and steamid of the person who sprayed for the sake of staffing. Not sure if staff can see that info or not, but no one will be able to report it if something happens without staff online.
I haven't gotten around to testing out versions of this in the workshop just yet, but it would be great to have a t/d shop item that provides ammo like a health station. Some of these maps are seriously lacking in gun/ammo spawns.