1) Integrated Liero's script to copy settings from one object to a bunch of selected objects
2) Split Rigidbody settings in toolbar into a separate panel
3) Scaling of objects should now be taken into account
Because Bullet ignores scaling on the actual objects, the scaling needs to be applied to the collision shapes before simulation, and reapplied to the matrices obtained afterwards. There may still be some bugs here, but so far it seems to work OK.
4) Collisions shapes use triangle meshes by default now
This works better to allow complex convex shapes get used as collision targets (i.e. Suzanne falling onto rugged mountainous terrain). However, in tests so far, this has been found to cause a few troubles for flat ground-planes getting missed by targets falling down. Perhaps there's actually just a little bug here. Otherwise, it's over to the community which one would be nicer to have.