Ken,
The paper types should not be greyed. However, the one thing that the paper types you name have in common is that if you try to load them into the "sheet" feeder, you will get a message that they should not be loaded there, and that "rear" is preferred. In fact, it will automatically reset the feed location to "rear" for you (at least on my Windows system) if you select "sheet." Are you trying to use the sheet feeder for these papers? It doesn't like it. But ABW will definitely print on those papers, as will color.
I cannot get my 3800 to grey out any paper types, though, no matter what, so you might want to try reloading your Epson printer driver.
Best of luck,
Aaron Dygart,
Honolulu