If it's a graphical limitation, let it be known that I have no problems with not seeing the 2nd throwing weapon while equipped/in flight.
So... pretty please? It's a core PnP rule; it'd make throwing characters much more entertaining and fun to play. And with the RoF as it currently is, it wouldn't be overpowered.
Did I mention it'd be fun? Isn't that the whole point of a game?