I added a stub article called Map_based_hacks. I don't know if that's the right name for QC tricks done in a map, so feel free to move it somewhere else.
http://quakewiki.org/wiki/Map_based_hacks
Also, re: tone, I agree that neutral is best for most articles, but tutorials are probably best in a more informal style, such as that used by Scampie. All the stuff I have written is fairly neutral - probably because I waste a lot of time on Wikipedia.
Also, I added some content to the Quake article last night:
http://quakewiki.org/wiki/Quake
http://quakewiki.org/wiki/Quake_story
The small section I wrote on custom levels on the Quake page needs fact checking. I don't actually know the real circumstances of the QuakeEd release, whether id made a Windows port or how the tools were released etc. I also remember a couple of maps made in text editors (!!!) such as daskull.
Another thing, I originally put a link to the Wikipedia article on Quake II, since I assumed we are wrtiting a purely Quake 1 wiki, but I later changed it to an internal link since we might want to have a short description of each sequel, as they are still related to Quake 1. Again, feel free to change that back to a wikipedia link if we are definitely not have any Quake II or III content.