Update idea to stop the game from getting boring and repetitive:
(#2) pelican plz see this
1v1 Duels:
It's a new gamemode which will be only played in the arena map or castles map.
Its a 1v1 or 2v2 without flags, just kills. First duo team or solo team which reaches an amount of kills (10-20) wins the game and gets extra score for the win (+250 or so, i dont know whats balanced). If you play 2v2 in a squad with 2 people, they are going to be in opposite teams, otherwise it would be way to unfair if 2 pros fight against 2 average players. In 1v1 you can't play squad as it would be a private match.
Now for the matchmaking so it doesnt become too unfair:
I could see a whole Elo system. Everytime you win a game in duels, you get elo, if you loose a game, you loose elo. The higher in elo you go, the better the opponents get and its less elo you get per win and more elo you loose per loss.
There could be a scoreboard showing the top players and maybe the elo will even be seen in your name (optional).
If you select the gamemode you will be put into a queue to find other people on your skill level.
That way you can improve your 1v1 (and 2v2) skills and work your way up the scoreboard to the best players in N1.