A lunar battlefield! Just imagine the craziness that would result from duking it out on the surface of a moon, complete with low-gravity effects that would allow a titan with jump jets to "fly" around the battlefield for extended periods of time. Knock-down hits would not only drop a titan, but also throw him one hex back.
Mine layers and mine sweepers! Use a fast recon titan equipped with a mine layer to set traps for unwary enemies, or send your own recon equipped with a mine detector to locate and sweep enemy minefields! An entirely new support class is born! (and a real good reason for a little extra leg armor)
Torso-mounted cockpits! Go ahead, shoot my head off. See if I care. (I know I'm not the first to come up with this one
Jocks who eject "airdrop" into a random hex, at a distance from the nearest enemy titan equal to the level of their life support system. They can then be targeted and fired upon by smaller-caliber weapons only (like machine guns) with a huge to-hit penalty. Tired of missing those kills? Try to gun 'em down after they eject. Want to save your own jock from this fate? You better hit the ground running.
Nutty I say!