Necromunda: Hired Gun

This can be started any time but is best saved for when you have enough currency to purchase upgrades to Suspensors found under Bionic Arms. Suspensors gives your character a passive aim assist that can greatly help you hit your targets while wallrunning. You can also use Perfect Aim found under Cerebral Implant, but this ability has a short activation period and a cooldown timer.

Heavy hitting, automatic weapons with a large magazine are probably best when attempting this so you can hold down the trigger the entire time you're on the wall. Just aim loosely in the direction of your targets and Suspensors will do most of the work, even with aim assist in settings turned off (the aim assist of the skill seems to affect the bullets, not your crosshairs).