Are you referring to the custom of "Cav Parking", where a player parks their Knights/Lancers in a remote location and then fights solo, using the troops as lives?
I'm not sure this needs to be specifically addressed. It was more of a problem early on when cav was significantly overpowered, but as the game has become more balanced I've been seeing it less, as it has become a less viable strategy. Even if you're up against an incredible cav player, their team usually ends up losing just due to a lack of support and maneuver from the cav player, even if their individual KDR remains relatively high. It can be super frustrating, but I don't think its overpowered presently.
Once hooked spears and spear bracing enter the mix this will become less attractive. I believe 1.5.0 is also doing some stuff to address couched-lance timings and horse uber-maneuvering, which is what these guys are really exploiting. I think this will be solved organically as the game tightens up.
