Lightning_Blue told me to start a discussion here after I was banned tonight, and to explain what I told him to the community.
Pancaking is exploiting the lack of a vertical speed cap in such a way as to make the lerk unhittable by conventional means, which means the lerk moves so fast as to be untrackable by anyone or practically unhittable. In order to exploit this, a lerk must fly vertically only (This is important later) and move as far up and down as possible as fast as possible. In larger rooms, this results in a speed that can top over 2000, and renders the lerk difficult to hit. However, moving up and down doesn't mean a lerk is pancaking. Any horizontal movement adds a cap which prevents the lerk from continually gaining speed, thus it's no longer pancaking. Avoiding marine fire by moving in a fashion that renders the lerk difficult to track is not pancaking, it's smart flying. In small hallways, pancaking is impossible by definition because the lerk can't break the speed cap due to the lack of vertical room to move. Pancaking is not moving up and down from ceiling to floor, it's moving vertically from celing to floor in an effort to lag the hitboxes enough to make the lerk impossible to track by regular means. A small room doesn't allow for massive speed (in fact you rarely break default cap speed in hallways), thus making it impossible to lag the hitboxes. Please understand this difference, and amend the rules to reflect this ackowledgement. "OMG PANCAKER" doesn't apply to lerks that kill you with bite and were difficult to hit, it applies to lerks that fly up and down and do nothing else in order to lag their hitboxes intentionally. Diving at you isn't pancaking, as the lerk will eventually have an uncapped DESCENDING speed, but not climbing speed, which is the actual exploitive part of the physics.