The javelin is a spear, basically replacing the short spear. It has a thrown range and you could give it a name change to shortspear for flavor purposes. I also don't think anything would be harmed by adding that 5/10 to the spear. That would leave the javelin/shortspear the best choice for range and spear and shield fighting, the spear would have a shorter range and a bit more damage, while the longspear couldn't be thrown at all. That's what I'm going to do if any of my players should wish to use spears.