I am sure this has been discussed before but I cannot find it.
Create an option for a player or team to surrender. In a team game all members would have to select the option.
Some maps take quite a while to finish even when the outcome is no longer in doubt. Maps like Conquer Rome, Kings II, Das, ect. Also, many trench games can drag on for quite a while. I suggest giving the players the option to surrender and declare the opponent the victor.
How this will benefit the site and/or other comments:
This is primarily a player benefit but should also speed up the finish of clan wars and tournaments.