There's an update in bleeding_edge, if anyone fancies trying it. I think I finally found all of the potential issues with joints attaching to null. I've had *ridiculous*-sized motherships now and absolutely no physics tornados. Prove me wrong! ;)
V1.11
-Joint disconnection is now smarter and 2-way, avoiding a potential 1-tick issue with joint forces.
-Fixed issue with dangling Twin Distance Joints.
-CPU Optimisation to rotating objects
-Low Detail now uses lower-quality normal maps.
-Fixed an issue causing a huge GPU performance overhead with non-instancing sprite rendering.
-Added some missing pad vibrations
-Fixed issue with a single distance joint filling up all the slots
-Removed unneeded physics joints for CPU performance
I haven't got time to test it properly before travelling for Christmas, so it'll sit there for a bit - feedback welcome!