So, that being said, what do we want the ranger to get when he wildshapes? Certainly attacks, natural armor, and movement modes. What about:
- Pounce?
- Poison?
- Swallow whole (probably not an issue due to the size limitation)?
Whenever doing so would be level-appropriate with spellcasters and item abilities.
For instance, Poison is SL 3 for Druid and SL 4 for Cleric. Since Druids would be able to put it on an item as early as level 5 and distribute such things amongst their party, a level 5 Ranger should be able to Poison once per encounter or such. Keep in mind that the actual power of poison is derived from the
type though.
If such an ability is deemed too powerful for a warrior (which I doubt) then delay it another 2 levels so that it lines up with Cleric.
Likewise, one could hold the same standards for any other character; Rogues could have an unlimited use ability (per encounter maybe) to poison their weapons with many varieties on the spot while attacking, archer-like warriors shoot poisoned arrows, mage-likes cast a ranged Final Fantasy-like poison effect (although it takes longer for effect and not as potent, should also deal damage at the same time).
In this way all classes are essentially capable of very similar tasks but go about it differently. That's how I do things.