Can charge after advancing or falling back, and can advance and shoot assault no penalty. That would help drones, melee plague marines, terminators, Daemon Princes and more. Morty would love it.
That's a cool idea and I can see some synergies with units that haven't gotten played too much - for example, it would make noxious blightbringer (bell guy with the advance rules) very good since he gives your infantry a boost to their advance rolls. Cool idea
That is the current white white scars chapter trait. It was an example, can't take credit for creating it haha. It just needs to be similar in scope and power to loyalist ones.