I don't think that would be too much of a problem due of the AP cost that would incur.
Since Crippling Blow is a melee skill, you would have to un-equip your ranged weapon and equip a melee weapon to use it. It would cost a ranged character a total of 3AP, a memory slot, and a point into Warfare to use in combat.
Additionally it would cost you another 1AP the next turn to re-equip your ranged weapon, so you are wasting a total of 2AP to weapon swap on top of the 2 AP to use the skill itself.
Finesse characters are better off dipping into Scoundrel or Huntsman for Cloak and Dagger or Tactical Retreat, while Intelligence characters can just use Teleportation or Netherswap if they want to disengage melee opponents.
