Pawn Wars

Two days ago, I found myself in this position in a correspondence game after my opponent entered a series of conditional moves. I had been playing for a draw through much of the game. Nonetheless, when a simple forced draw was in front of me, I determined that it was time to think about pawn wars. Is the repetition that I can force in my best interest?

I had Black. This game was played on ChessWorld (see link in sidebar).

Black to move