Hmm. Most of your requests are fairly easy. And number 1 requires no coding knowledge at all.
1. Just import SOD walls using ChaosEdit or FloEdit.
2. There's a tutorial for this on the Wolf3d Dome Coding Section
3. See answer to No.2.
4. Have to enable helpart/finart/endart stuff.
5. Believe you can comment that out in the code.
If I had more time I would help you. But neck deep in my own mod right now. Actually, I think quite a bit of ppl around here are involved in making their own mods right now.
You should learn some coding basics yourself. Trust me when I say it starts to make sense pretty quick. I knew absolutely nothing about coding a year ago. Plus, those code changes you want to do are not too difficult! Great starter material!!