I was trying hard to get some kewl hats or skins working for us, and failed due to most plugins not being compatible with zps.
Some servers you know have them because they found a working plugin or they found a different way to set up the plugin I used so it works for zps.
Despite this, some are still getting "extra" downloads and can be a burden. It should not be doing it now since I took them off, but if it still is please let me know.
Tested it today in the morning (10 hours ago) and a friend vertified that he didn't get any extra downloads (just the map itself).
