Just throwing in something. Arcing weapons and explosive weapons may not be a good criteria for extracurricular throwing training.
Assault Cannons w/Expl. Cannonballs do exist.
They're cheap, they arc, they explode. They're pretty accurate. They're early game weapons which entirely replace grenade launchers, and most other things of that nature. Cheap and light ammo too, that is quick to manufacture. They last all campaign as perfect hand-me-downs, but are also good for experienced gals.
I'm fine if the intention is for one of the best workhorse weapons in the game to *also* train throwing, but I don't think that's the case. But it could be.
Every noob with 20+ str can get one and two reloads with runt duds on, and maybe a backup bow (or set of fuso knives) if they're strong enough, until they're worthy. Or if they're awesome anyway.
Flamers arc too, and have a blast radius. A Gym Suit or Bikini and they're great. Another perfect workhorse weapon, for noobs and bosses alike. But for training other skills too? 8 potential hits a shot, and most things require a few direct hits to go down. Would synergize perfectly with bows too, even with an accuracy drop for two-handed.
They'll get some hits, some kills, and will now also train throwing. Intended?
Not a biggy, because they already get hits or kills with these weapons. It just gives them an extra skill to tick upwards. Probably for their backup weapon anyway (aside from a cattle-prod). But they're belt, QD or offhand weapons, with essentially unlimited ammo, that come on pretty early and are cheap as well. Knives for cannoneers, bows for cooks.
I can see a couple of "perfect warrior" builds coming out of this, if the above weapons train throwing as well. Add a backpack prod after strength gets high enough and there's nothing you can't try to do with these gals.