ATM there is - ut4_abbey, ut4_turnpike, ut4_algiers, ut4_austria, ut4_prague, ut4_casa, ut4_uptown, ut4_sanc, ut4_toxic, ut4_elgin & ut4_kingdom.

would it be possible to add (as these maps are better for CTF)
ut4_harbortown
ut4_ambush
ut4_oildepot
ut4_subway
ut4_mandolin
ut4_crossing
and
ut4_tombs
IMO i'd rather most of these over some other maps(ut4_algiers/ut4_toxic/ut4_elgin) for ctf

and remove
ut4_kingdom (it has alot of glitches and roof exploits)

i agree there only played this on a private LAN though soo i wouldnt know much about online play

some of those maps are pretty big though, remember its a 5v5 tourney

the majority of those are a bit big, but harbortown and ambush could be included

indeed some are quit big, but i could still see oildepot, harbortown and ambush added
and kingdom removed