Alright, I discussed this a bit with AD in skype, but I think it might warrant a thread.
Currently, ID and engagement rules remain unchanged in regards to POBs, except for 5.3 d): Players < lvl 30 may be attacked if attacking a POB.
However, I see this as problematic.
Attacking a POB isn't like attacking an NPC base. It's more like attacking a player, since it directly affects the time and effort of players in charge of the base.
And yet, there are no restrictions whatsoever regarding which ID and ship can attack a POB. This is fine, there shouldn't be.
But defending, on the other hand, is highly restricted. The rules for engagement of base attackers are the same as general engagement rules, so theoretically people could be sanctioned for defending their base, unless their ID allows them to engage ships with the attacker's ID.
As far as I know this hasn't happened yet, but I think there need to be more clear rules regarding POB defense.
What I suggested in skype and what I'm going to suggest here is:
POB threads list registered defenders, individuals and tags, that are permitted to attack players assaulting the base in question, in a manner similar to how bounty boards work.
I mean like I said, I don't believe anyone's been sanctioned for this, but technically players defending their base would be open to a pvp-related sanction.