Now, in order to rank up, you can take place in any type of pvp you want. For example, 1v1, 2v2, 3v3, and 4v4.
But on the character statistics sheet, i believe you should be able to see how many 1v1s, 2v2s, 3v3s, and 4v4s, you have won/lost SEPARATELY.
Yes, the total overall win/loss ratio would still be there and count towards the overall ranking. But this way, it'll help you and others see what you specialize in.
And since most warlords have done hundreds and even thousands of pvps, they'd be able to keep track of which ones they participated in. Just an idea.