TBQH, the flag isn't worth much to the bigger alliances in CN - those close to sanction should actually be encouraged NOT to win one through CN:TE.
MK learned this the hard way.
When a big alliance (say, 190 members) wants to play TE for a flag in-game, they can probably expect to get ~50 people to play (more if they're very active, possibly less). That's 50 who won't play currently.
The way to (slightly) encourage participation? Allow victorious nations to change their flag if it's an alliance flag, and that alliance gains sanction.