Could it be possible, if throwing spears were included, that they ended up being used like ammo? They would be semi-recoverable and could be a new crafted item. Just a thought..
This is what I've been saying about thrown spears, or javelins, if you prefer. I know they are something different than bows and crossbows, but they could have them fall under the Archery skill tree. The Archery perks could work with such a weapon. It's just the title of the Skill that throws it off...Archery. If it was 'Marksmanship' or 'Ranged' it might fit better with other thrown or ranged weapons, but the mechanic is there. It could even be used for throwing daggers, knives, axes, darts, slings, etc.
Or, at the very least, use Telekinesis or Unrelenting Force to launch your spears
