I use a mod called Quark which adds small features that improve game play. I don't use many things in the Quark mod, except to build easier so I do not have to crouch and build on the edge of a block, instead I can build in front of a block and it will place it. I just need to know whether I can use this feature, or if the mod itself isn't allowed at all, because of the other features such as the sort chest/inventory feature. (This doesn't work on the server, as I have tested it.)