Contacted the developer regarding limiting amount of warps allowed per player, got a reply pretty quickly and the feature added to the plugin shortly after, very happy with the support received, thanks :)
I was the person who requested for the plugin. Thanks a bunch for making this! It's working great on my server so far, and I couldn't have made a better one myself (I tried). A few suggestions I'd like to make is (1) Using /iwarp list works for offline players as well. I think you would have to use the depreciated getOfflinePlayer method for this. (2) When any player warps to a warp which expires in less than 1 day, it'll warn them that the warp is expiring soon and they can use /iwarp renew to renew the warp. (3) If a warp was created with /setwarp instead of /iwarp, it shouldn't show up when a player uses the `/iwarp list` command. Perhaps this could be done by checking to see if the warps are also in iwarps.yml.