Never give up. I think this is one of those chicken and Egg conundrums. ANYONE who has used the 3d mouse accepts that it is far superior to working with just a mouse. Epic has said that there just isn’t that much call for it, but I think once it is in there you would see a heck of a lot more people using it. I use 8 Different Modeling/CAD/CAM Programs and the 3d mouse means that I can move and navigate freely, without having to remember awkward key combinations. Keep reminding them to get this incorporated into the engine. The work has been done, there is a plug in out there and it works just fine. It just needs to be more visible, or better yet incorporated into the engine itself.