So it's already been mentioned in the karma discussion that FDev are contemplating putting a system in where murdering a player of a significantly below combat rank and/or a significantly cheaper ship will be tracked. Perhaps the crime and punishment can revoke someones permit access if they commit too many of these killings in a specific system which say has high security. A starter system could be put in this bracket.
In short most players can go in and out unhindered, the Fuel Rats, explorers, CG traders, miners, bounty hunters even pirates. Even the guys attacking Adeles Armada wouldn't notice as AA are mostly high rank pilots in Elite ships so it shouldn't affect powerplay.
The only ones that will notice it are the ones that regularly attack and kill players with cheap ships and low combat rank. For everyone else they won't even notice it there which is exactly as it should be.
Permit comes back after say 1 month but is quickly withdrawn again if murders/attacks on weak players resume or if the player does not go on another rampage it resets back to a neutral state.
Nice neat system.