You can already use Staffs and wands as a regular weapon as it is.
Though my imagination doesn't stretch so far as to understand why, say, a sword enchanted to attack from afar would need to be a cosmic sword handed down from the gods. Especially since most items in the game are heavily magical as it is.
Or heck just a Staff that is essentially a large mace... why it would also need to be a legendary object.
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I should state that Hybrid weapons aren't restricted to just Mage + Physical archtypes. It is just that magical weapons are the easiest to think of without stretching your imagination.
A Two Handed Bastardsword that counts as a knife for the Scoundrel. That is a bit trickier to imagine.
Crossbow with a Bayonet easily fulfills a Scoundrel + Ranger.
