The Sorceror can normally not use any sharp weapons capable of chopping or cutting down trees or other growths in nature. If he as much touches such a weapon the spirits of nature will flee from him, rendering him unable to cast spells until the next Sunrise or Sunset depending on his speciality . . . . So the only weapons he can use without penalty are clubs, flails, war flails, staves, hammers, maces, slings, staff slings and rocks.
So according to the book, a sorceror can't use a spear, bow and arrows, or javelins. However, none of these weapons are capable of effectively cutting vegetation of any sort. Shouldn't a sorceror be free to use bladeless pointed-weapons without penalty?
The sorcerers in my games are not allowed to use weapons that contain any metal. Effectively you can damage growths of nature with a flail, club etc, but they are not sharp weapons, which according to the lore, would frighten the spirits. You could say that you could use a spear with a flint or obsidian spear-head, but perhaps the spirits would not be able to recognise the difference?
At the end of the day, you are free to modify things a little bit if you wish.