How many Immediate action spell / class ablity/ actions are there?
I know 4 spell and AoO.
1 Feather Fall CORE
2 Liberating Command Taldor Splat
3 Dweomer Retaliation CheliaxSplat
4 Emergency Force Sphere Cheliax Splat
Total 5
Let us list them and give source and runing total.
I real do not think that is realy that many.
Not a comprehensive list, by any means, but here's what I found at a quick glance.
Feat: Step Up
Feat: Following Step (APG)
Feat: Arcane Shield (APG)
Feat: Fight On (APG)
Feat: Heroic Defiance (APG)
Feat: In Harm's Way (APG)
Feat: Saving Shield (APG)
Feat: Sidestep (APG)
Feat: Swap Places (APG)
Feat: Under and Over (APG)
Inquisitor: Discern Lies (APG)
Plains Druid: Savannah Ambush (APG)
Community Domain: Unity
Luck Domain: Good Fortune
Deception Subdomain: Sudden Shift (APG)
Honor Subdomain: Honor Bound (APG)
Love Subdomain: Adoration (APG)
Martyr Subdomain: Sacrificial Bond (APG)
Wards Subdomain: Warding Rune (APG)
Feat: Accursed Critical (UM)
Feat: Antagonize (UM)
Feat: Die for your Master (UM)
Feat: Divine Interference (UM)
Feat: Sorcerous Bloodstrike (UM)
Effect Word: Alignment Shield (UM)
Effect Word: Force Block (UM)
Karmic Bloodline: Fate's Retribution (UM)
Battle Mystery: Battlefield Clarity (APG)
Battle Mystery: Surprising Charge (APG)
Life Mystery: Delay Affliction (APG)
Time Mystery: Rewind Time (UM)
Dual-Cursed archetype: Misfortune (UM)
Dual-Cursed archetype: Fortune (UM)
Possessed archetype: Dual Mind (UM)
Alchemist: Instant Alchemy (APG)
An AoO is not an immediate action. If it was, you wouldn't be able to take a swift action on the turn following any AoO you make.
There's more than you might think. This is what a search for "immediate action" in the CRB, APG, and UM found me. I skipped a few spells that are not immediate actions but let you do something as an immediate action sometime during the spell's duration.
Core Rulebook
Clear Mind, Barbarian
Strength Surge, Barbarian
Mighty Swing, Barbarian
No Escape, Barbarian
Unity, Community Domain
Good Fortune, Luck Domain
Resiliency, Rogue Talent
Use mount for cover, Ride skill
Mounted Combat, Feat
Step Up, Feat
Feather Fall, Spell
Parry, Duelist
Advanced Player's Guide
Instant Alchemy, Alchemist
Strategy, Order of the Dragon
Act as One, Order of the Dragon
Shield of the Liege, Order of the Lion
Protect the Meek, Order of the Shield
Discern Lies, Inquisitor
Battlefield Clarity, Battle Mystery
Surprising Charge, Battle Mystery
Delay Affliction, Life Mystery
End Life Link, Life Mystery
Spell Supression, Magician
Spell Catching, Sandman
Inspiring Blow, Skald
Sudden Shift, Deception Subdomain
Honor Bound, Honor Subdomain
Adoration, Love Subdomain
Sacrificial Bond, Martyr Subdomain
Warding Rune, Wards Subdomain
Savannah Ambush, Plains Druid
Ranged Defense, Archer
Quick Sniper, Crossbowman
Reversal, Free Hand Fighter
Ready Pike, Phalanx Soldier
Shielded Fortress, Phalanx Soldier
Pole Fighting, Polearm Master
Step Aside, Polearm Master
Polearm Parry, Polearm Master
Deft Doublestrike, Two-Weapon Warrior
Reliable Strike, Weapon Master
Deadly Critical, Weapon Master
Mystic Insight, Ki Mystic
Touch of Surrender, Monk of the Lotus
Bolster Companion, Skirmisher
Catfall, Skirmisher
Heel, Skirmisher
Second Chance Strike, Skirmisher
Uncanny Senses, Skirmisher
Vengeance Strike, Skirmisher
Assault Leader, Rogue Talent
Another Day, Rogue Talent
Counterspell Mastery, Counterspell School
Arcane Shield, Feat
Fight On, Feat
Heroic Defiance, Feat
In Harm's Way, Feat
Saving Shield, Feat
Sidestep, Feat
Swap Places, Feat
Touch of Serenity, Feat
Under and Over, Feat
Blaze of Glory, Spell
Borrow Fortune, Spell
Foe to Friend, Spell
Gallant Inspiration, Spell
Hero's Defiance, Spell
Paladin's Sacrifice, Spell
Saving Finale, Spell
Stay the Hand, Spell
Timely Inspiration, Spell
Inspiring Command (after 10th level), Battle Herald
Divine Judgment, Holy Vindicator
Divine Retribution, Holy Vindicator
Divine Wrath, Holy Vindicator
Plane, aligned, Horizon Walker
Spirit Warrior, Rage Prophet
Clear Mind, Stalwart Defender
Intercept, Stalwart Defender
Ring of Retribution, Magic Item
Ultimate Magic
Reflection, Magus Arcana
Spell Shield, Magus Arcana
Hateful Retort, Anger Inquisition
Judicious Force, Justice Inquisition
Defense, Preacher
Spellblade Parry, Spellblade Magus Arcana
Rewind Time, Time Mystery
Misfortune, Dual-cursed Oracle revelation
Fortune, Dual-cursed Oracle revelation
Two Minds, Possessed Oracle revelation
Anchoring Aura, Paladin Oath against Fiends
Loyal Oath, Paladin Oath of Loyalty
Loyal Guardian, Paladin Oath of Loyalty
Fate's Retribution, Karmic Bloodline
Cooperative Defense, Wood School
Dueling Counter, Spell duels
Accursed Critical, Feat
Antagonize (Intimidate), Feat
Die for your Master, Feat
Divine Interference, Feat
Ensemble, Feat
Sorcererous Bloodstrike, Feat
Word of Resolve, Spell