This build allows you to stay alive a long time while still being a threat to the enemy team - even if you lose both side torsos. The big engine provides enough mobility to get into and out of the fights quickly.
Working on a basic Crab that will take advantage of that 'Standard IS Laser' duration quirk and the higher engine cap. For a zombie pulse build, I use a CRB-27. This CRB-20 is simple, fast, tanky (zombie), and runs five quirked medium lasers. Pair this with skill nodes to shorten the duration even more, survival, and speed tweak, and it should be a nice skirmisher/scout. Alternatively, to really go as fast as it can, here's a version with a maxed-out LFE: