you serious? mid ctf is the position anyone with decent aim and some basic understanding of quake is able to play (...and it's kinda boring unless you love railrailrailrail).
try to get a hold of the q3ctf eurocup demos. ec 9: aaa/xyz/gos and ec 10: gzd/s?/gzd/foe ec 11: gzd/eye/foe/neu/s?. it's a shame clanbase ftp deletes all the demos after a short while so no idea where to get them :/