(Posting this, tho with hidden name of item, since it's unfinished playtest, so probably no full version anywhere... at least noone managed to find it so far)
"may be enchanted as if they were masterwork weapons to gain enhancement bonuses to attack and damage or weapon special abilities. See Table: Melee Weapon Special Abilities (see Paizo: Pathfinder Core Rulebook ) for a list of abilities. Special abilities count as additional bonuses for determining the market value of the item, but do not modify attack or damage bonuses. An [[NAME]] cannot have a modified bonus (enhancement bonus plus special ability bonus equivalents) higher than +5."
Question is, would that +5 restriction apply all the time, or only to pernament enchantments?