Personally I think that Fall Back is penalised enough with being unable to Shoot or Charge afterwards without suitable abilities/Stratagems. The problem with it is the unit that is left behind, which suddenly becomes vulnerable to others who can shoot.
For me the better fix would come in two parts. First, non-Pistol weapons can longer be fired at units within 3" of a friendly unit. This gives a bit of leeway between a unit that is close to being in combat, and actually in combat, and I think it's about right for a distance at which stray shots could very easily hit a friendly unit instead so makes sense.
The second part is that the unit(s) that are left behind (no other enemies within 1") should get a D6" consolidate move that can take them within 1" of enemies (and counts as a Charge if they do). Since most Infantry have a 6" Fall Back move this means there's a 1 in 6 chance of catching them. Otherwise your hope is to either get within the 3" safety umbrella, or into some kind of cover instead.
To me this seems like the right balance, as it makes it less likely that a unit that is left behind is now suddenly in the open and vulnerable to the enemy's other units. It also makes it more important that when you Fall Back that you have other units to hold the enemy in place, since the consolidate move wouldn't trigger for units still in combat. So you could leave a hero behind to hold them, or a chaff unit that's already doomed, while a more valuable unit gets away (for now).
Units like Dark Eldar Wyches that have a No Retreat ability still have the benefit of being able to prevent an enemy from fleeing at all, which still has the added benefit of staying where you are, and avoiding any chance of a Fall Back ability or stratagem from being triggered at all.
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