Before I already wrote that I was working on adding more of the FSX specific options to the ModelConverterX materials. This is almost done, only adding good descriptions for in the Material Editor description area is not completely done. But while working on this, I decided that the whole Material Editor GUI could use a small update. Below you see the new interface:
The biggest is that the panel can be resized more easily. For example you can now decide yourself how big you want the left or right column of it. So if you many want to look at the preview picture you can make that bigger. I have also added an option that allows you to preview the alpha channel of the texture.
Currently I am still in Canada for work, but once I am back next week I will commit these changes and then they will appear soon in the development release.