if you mean 3dsmax RTT dialogue it should be possible to define the custom UV channel to any number that is available in your poly at the top of the dialogue.
Onto the suit in 3dsmax with some helmets and bio bugs :) Notice the tractor version with the nifty tread. A pretty high density retopo of the skin parts.
The Tower of Orthanc - as designed by Alan Lee Originally started in 3DSMax, and finished in Maya, this was one of my earliest projects. A fly around can be seen here on Vimeo.
I started using Zbrush, 3dsmax and Photoshop for all mostly but now i updated my workflow to make things easier , faster and cleaner with Xnormal and 3dcoat :) .