1) Guard won't shoot blockers. Blockers will simply become not protected after some time.
2) Actually... they won't become not protected, because they can move from blocking hex to normal hex from time to time...
3) Of couse it counts as exploit, and when GM see that he bans all exploiters.
4) марфей was seen by me many times doing different blocking exploits on different locations. I think such players should be banned for more than 24 hours.
Suggestion:
1) I saw guards/NPCs can push others to make thier way further, of couse they're doing that very lazy and... unsuccesful, I want suggest to make guards and other NPCs use jedi force push that will work like knock back and paralyze victim for 3-4 seconds, also guard can shout something emotional when doing that.
If target of that power still on the same hex (something prevents moving it further), guard bursting him in the face, and then continue his way.
2) Add Cooldown for blocking, which will diminish very slowly, so if you once stood on door path more than 1 second it'll start, and it'll have ariphmetic progression, so the more you stay the more CD you getting, if it reaches some ammount, guards shoot you. This CD diminish with a time slowly.