Revvy
In addition we could add that Marauder can attack also Marauder, lore wise it make sense.
And +1 for the idea, it was since long time requested on Atys.
Mithian
The description you give from the Wiki was the Faction PvP as it was used to be before the Merge
If you find a way to prevent the abuse that had happened with the old system.
Still, it was nicer than the one today, even with its flaws.
I'll vote for reverting back to the old system (pre-merge).