Yeah, it is too powerful in its current state. I'd like to keep it relevant, at least with weapons and other heavy gear, but the skill definitely needs a nerf all over.
For the next version, you're able to equip throwing items in the firearm (renamed to ranged) slot. So you'll just press the fire key to throw instead once the correct item is equipped there. Stackable items already in your inventory are also picked up by walking over the tile, so that solves two gripes :)
I had thought the throw key (default is T) would be good enough, but selecting the right item to throw is still tedious every time. This will still be the main way to throw non-throwing items, as I don't want to clutter the actions menu too much for every item.