In skills & powers for AD&D 2nd edition there's a rule that says
"Character Class Restrictions Non-warrior characters are normally restricted by the rules dictating the types of weapons they can acquire proficiencies for. However, by spending extra character points for a weapon proficiency slot, a character can purchase a proficiency that he would otherwise not be able to possess. A rogue or a priest can acquire a proficiency for a weapon that is normally restricted to a warrior’s use. One additional character point must be spent when the slot is purchased—the slot will cost 4 points, instead of the 3 rogues and priests usually pay. A wizard can spend 2 additional character points to become proficient in a weapon normally allowed to a priest or a rogue. If the wizard wishes to become proficient with a weapon that is normally limited to fighters, however, he must spend 3 extra character points."
And a Table that lists penalties for non proficient and familiar:
Warrior –2 –1
Wizard –5 –3 Priest –3 –2 Rogue –3 –2 Psionicist –4 –2 Nonclassed NPC –4 –2
As a DM I am wondering what is a good Cost for Psionicists to use Class Restricted Weapons, as their penalties do not line up either with the Rogue/Priest (5 points total penalty) or the Wizard (8 points total penalty).
The cost theoretically appears to be 3 points if we think of them as Wizards, but they use d6/+2 for hit dice, and use Rogue THAC0, so should we use the 2 point penalty instead?
Additional notes: There are psionicist kits like Shinobi and Janissary that use restricted weapons.
Trivia: the 1st edition Psionicist in Dragon 78 was allowed "swords" but not Two-handed swords.