Team FFA is a gametype that can be played on any map that supports it. In JK2 I had (and still have) Team FFA games on FFA maps, CTF maps, and even dueling maps (duel_temple). You should be able to use any FFA map or CTF map for TFFA. So just use
/rcon set g_gametype 6
/rcon map mp/ffa5
/rcon map mp/ctf1
It will start a TFFA game on that map.