well yeah it could but he would have to write it from scratch, surely its easier just to port something thats already done that, plus id imagine the vavoom would have a wad selector at the startup so no messing around in root swapping wads or long xterm commands. cant see that it would just boot up a random wad when designed for mulitple games. just simplies everything. i cant actually install vavoom to check if it has. but ill float around thier forums,

also another point is people using vavoom seem to have enhanced graphics for doom/hexen not sure how that works, also plenty of tuts thier for level design. surely its better than starting from scratch when its just a click away already done just need to put the "icing on the cake"

EDIT: well no wad selector, but they've made short commands to launch

"If you have multiple IWADs, you can use command line params -doom, -doom2, -tnt, -plutonia, -heretic, -hexen or -strife to look for IWADs only for that game. Hexen requires a wad file from version 1.1."

also has quake-like console which is always a bonus, seems on the forums they are in the middle of getting mulitplayer functioning at a decent speed, low frame-rate atm.