It's fine as it is. A short message won't do much a harm to a probable assaulter. We don't need bass hunters again.
Yes we do. Currently bases are too easy to defend and too easy to supply. Balance is already towards the base owner being able to push his policy and roleplay upon entire groups of people.
For some reason we do not have this "Required to roleplay before constructing". Only required on attacking. I mean this is just rule eforced powergaming. And anyone who came up with such rules or current POB system needs to GTFO from dev team before he damages this community even further.