I was sure David said in one of his blog's that the modified disruption movement was going to be included in the PzC Gold upgrade and the fact others have said it is included in the manual seemed to confirm that fact, but if it does not work like that in practise then maybe that didn't happen
The idea of the modified disrupted movement was to encourage players to retreat rather than hold ground until it was too late and have units trapped, we were seeing a lot of this in FWWC, so disrupted units were given full movement allowance on day turns (rather than 2/3) but to prevent players taking advantage of this change to move forward, movement towards a spotted enemy unit was increased by x3.
At least I can with certainly this is how it works in FWWC!