IMHO, a simple utility class that does this would be sufficient. I really don't want to add it to the core. I'll consider adding one in one of the next releases (most likely not in the next one, but in the one after that). Then again, if you really need something like this now, it should be pretty easy to code it yourself. Afterall, it's not much more than creating an ellipsoid (can be done with primitives) and adding it as a child to the colliding object. You don't even need lines for this. A transparent object should do, or doesn't it?