[RC-Monster Mike]

If you have a healthy flat spot on the motor shaft(like Castle or neu), the pinion can be quite loose and the motor will still enagage. It can happen and has - just thought I would make mention of it.
All our items start production in house until volume justifies sending it out(or my time). Yes, I could make it, but not very fast, as I am up to my neck in projects at the moment.
Regarding the oil/lube flying off - I would run dry myself, but a sticky lubricant in very small quantitiy would be the most I would suggest. You wouldn't want the main power transmission to have to trudge through any oil at all - it would rob tons of power and generate a lot of motor, esc and battery heat (would have the same affect as oil in the sealed front/rear diff in that it would SLOW DOWN movement). If using the Slipperential, it would serve to defeat the slipper(make it too slippery) anyways, but even a straight diff shouldn't run through liquid on the power side. :)