I did throw in a move-action jaunt up to a distance equal to their movement, with line of effect. I figured it'd be good to get through a crowded area and avoid AoOs. I wasn't sure if I wanted to give them the equivalent of Abrupt Jaunt, but that was before I considered giving these guys reflexive abilities.
I think for each of the classes we need to be able to answer a few basic questions:
How do the contribute in a fight? How do they survive a fight? How to they contribute outside of a fight?
Good point:
AeroHow do the contribute in a fight? Some crowd control (some AoE, some push/trip abilities), electric and sonic damage. Summon elementals.
How do they survive a fight? Mobility. Avoid being hit and confound the enemy.
How to they contribute outside of a fight? Get to hard-to-reach places. Teleport. Summon elemental to do tasks. Detect/Dispel Magic.
GeoHow do the contribute in a fight? Smash stuff, buff self and others, some crowd control. Summon elementals.
How do they survive a fight? Take hits and be tough. Set up walls and such to funnel enemies and divide and conquer.
How to they contribute outside of a fight? Stone Shape and similar spells to alter dungeons and structures. Burrow. Summon elemental to do tasks. Detect/Dispel Magic.
HydroHow do the contribute in a fight? Ice and acid damage. Some crowd control. Healing. Summon elementals.
How do they survive a fight? Not sure yet. Avoid/mitigate damage?
How to they contribute outside of a fight? Heal. Do stuff underwater. Summon elemental to do tasks. Detect/Dispel Magic.
PyroHow do the contribute in a fight? Burninate, use smoke and walls of fire for minor crowd control or debuffing. Summon elementals.
How do they survive a fight? The best defense is a good offense. Fire resistance/immunity. Reflexive retributive fire damage.
How to they contribute outside of a fight? Burn obstacles. Get to hard to reach areas. Summon elemental to do tasks. Detect/Dispel Magic.
Also, all of these classes are Cha-based casters, so they have the potential to be the party face, at least at low levels, when the Cha mod is as important as ranks.