Bumping and rubbing through/past another war behemoth sounds like "difficult terrain". A modest (40%?) 2 second max speed drop for contacting vertical polygons (building edges, other mechs) would keep speed freaks from bashing through other mechs, giving those mechs time to turn and attempt to fire. Additionally, use that JJ shake for 1sec if you are more than 15tons lighter than the object you struck... you rung your own bell there.
I think this would keep the rage against swarms bumping and bashing through heavy/assault mechs, stopping them in their tracks from collision, then circling. But I don't think any of those penalties are the death sentence of falling over in front of a dakka-phract.
Edited by Cycleboy, 16 October 2013 - 05:53 AM.