Please dont put FF on, it will ruin the assault map, since the map is mostly in a close combat situation, with FF on will create a lot of inconvience.
Such as.. what if CT trying to rush BBD? You'll have more CT TK than Ts Killing CT, and with no offence, noobs tend to spray when they got flashed..
triple TK when got flashed? I can see that happen
But if, if there is a huge public demand on having FF on, maybe you can look into having a auto kick system which will kick people for intentional TK, or in some other servers which I played
they have auto kill when people trying to shoot each other in spawn, and 3 TK in a short time will result in a temp-ban maybe about a day.