Sorry, but Deathmatch does not need to be any more complicated than it is. Deathmatch mode is bare minimum: for killing enemies and nothing else. There is no teamwork, no EU, no missile silos, nothing other than you and your enemies.
Besides that, as a few people have said here already, this doesn't actually help new players. Optimizations are tiny, and the differences between a level 20 mech and a level 1 mech are small enough that a good player will reliably win even at a major level disadvantage. All your suggestion would do is make the newer players get their mechs to max level sooner, without encouraging good gameplay and most importantly without learning. All this encourages is moving toward radar blips if you're losing. Like Dreizehn is saying, "coddling the noobs" does not help. The only way that a noob will get better is by playing the game, not by running around collecting free experience.
This all being said, I do think a variation of the idea could work as a separate game mode, specifically an alternate Siege mode. Instead of experience orb drops, the mode would instead drop EU canisters randomly across the map, and teams would have to constantly be on the move as the EU canisters expire and new ones arrive.
Edited by Underquotes, November 24 2012 - 08:18 PM.