So I was messing around when creating H.S. Corruption and I have found a new set of physics… It keeps a block in its place like a block with movement turned off, but can fall! http://flowlab.io/game/play/267146
You may use this rig for anything that might fall but not move out of place… Just a warning @grazer for some reason it gets unstable and/or it may catch a corner of a nearby block and fall. Even though there is nothing moving them out of place