Scroll down to post #14, Varg's post.
Some druid attacks are listed as spells so there is a choice between spellcasting and melee. If you want all the attacks for Wolf, you give up spell slots for doing other things. You can change your mind in town, but not in the middle of a dungeon.
4 Reasons why this was and is a bad idea:
1) Druids can only heal themselves from their spell points or potions while in animal form.
2) This mechanic makes druids the only class that has to use spell points to perform melee attacks. Fighters don't need to use spell points for Cleave or Stunning Blow, do they?
3) Being raged or under the effects of an anti-magic field prevents these claw and biting attacks from being used.
4) Spell cooldown penalties from being in animal form and stances like Combat Expertise or Resilience stack.