Is there such a thing as a floating enchantment bonus ?
abilites like arcane duelist bladethirst got me wondering
can you add a +1 bonus to weapon that the weilder can swap from flamming to frost to +1 as a swift action ?
If so I'm assuming it would cost like +2 or +3 to add ?
Sounds very similar to a paladin's celestial weapon ability, that is the closest thing I can think of in the RAW.
Neat idea, probably worth a +2.