It's funny to see that when someone suggest a new weapon, they normally suggest it with overgrown properties.
Every throwing weapon is really BAD when comparing to their 1h or polearm counterparts in terms of usability (throwing axes when used 1h are short and not damaging, jarids and throwing jabelins are short and slow), anyway, here you are suggesting a weapon that is even better than one that yet exist in the class you suggest: the fighting axe.
So my suggestion to you: STFU and use one slot for the fighting axe, don't forget to use it 2h mode ....
I REALLY tried to be constructive, but your suggestion provokes only destruction.