a nice feature would be a list of "layers" if I can call it that. Just like in photoshop, once you've filled a Polygon in a layer, it'll stay in that layer, and if the layer gets deleted, the polygons in that layer will also disappear. Will also make it easier to use this tool.
EDIT: I tried to place some points and areas, and then press "Clear Previous Points", but nothing's happening.
I don't understand why you need a register/login system when you already have a login system for LFS itself. Maybe you're hosting a cracked server, maybe you're sending this message for someone else.. You're not getting my help for this.