Dont allow guild members to join opposite team in CTF
Make it so members of the same guild can only join one team in CTF this isn't just because of kill/flag farming but theres certain guilds *cough* especially one in particular *cough* that will get 5 members on one team & then they will put one or two of their guildmates on the opposite team and those guildmates go afk so that the 5 guildmates on the opposite team can easily 3v5 you, this happens way too often & it makes PVP less enjoyable.
(Only saying for CTF because in TDM you get the "troll bane" ap/title)