Maybe if you made it clear that you were following the posted guidelines by posting questions not already answered by them, people wouldn't feel the need to remind you of them repeatedly.
You asked if it's possible to play other wads, this is answered in many, many, many places. Where to get these wads, and what they are is beyond the scope of the Rockbox project. They're simply Doom wads, which there are plenty of resources on on the internet.