I just had my first opportunity to use another feature that AnKor had mentioned in his original notes to us that was still untried at the time.
I was working on adding the same shading and reflective glass effects that I've completed for the outside view models, to the some of the interior cockpits. I had only done a couple and was getting a nice enhancement to the 3D look (example below), when I decided to see what it looked like at night. Everything looked fine until I turned on the UV lights to see the gauges. Talk about ugly!
At first I didn't understand what had gone wrong, but then I remembered the prohibition for having more than one helper texture assigned to a name. In order to get the shading on the cockpit surfaces I had created a new +sr file. Not a problem, until I also tried to access the +clight file too. (Normal maps are an exception to the one helper texture only rule.)
Fortunately, AnKor had provided a way out for me. I created an alpha layer in the +clight file that had the same +sr information in it, and then renamed it +clight+sa. Deleting the two other files, and Voila, problem resolved!
The only disappointment still remaining is that almost all of the original gauges we have were done as flat decals without lens glass, so there's no opportunity to provide them with dynamic shading and reflectance effects.