firing at hex with multiple targets

[Otto von Blotto]

I do have a couple of concerns about this, I'm not ruling it out altogether as a possible way forwards as the idea does have some merits but I would like to know how you would deal with.

a) disruptions and retreats would that effect all of a type as well or just the single unit attacked.?
b) sometimes I like to concentrate fire on a particular unit in a hex, to whittle them down, say if one is on 6 strength and another on 2 or 3 I would sometimes like all the hits to come from the 6 strength unit and not be spread how could I still do this.?
c) tanks and hard targets, how will the rule deal with facing, not all armor targets in a hex is all facing in the same direction ?

Edit one extra, again would they have to be the exactly the same unit what if a panther and a tiger were in the same hex ?