Besides the Helpful trait, are there any other ways to boost the Aid Another action? More specifically, reduced the action cost or make it worth even more?
Speaking of Helpful, would it apply for the Divine Strategist's Caster Support ability?
A divine strategist can use the aid another action to assist another divine spellcaster, granting a +2 circumstance bonus on caster level checks and concentration checks until the beginning of the divine strategist’s next turn. This bonus increases by +1 at 4th level and every four levels thereafter (to a maximum of +7 at 20th level). The allied caster must remain adjacent to the divine strategist to gain this benefit. Caster support can be used to assist arcane spellcasters or characters using magical items, but they gain only half the normal bonus.
You see nothing wrong with letting others achieve greatness so long as the job gets done.
Benefit: Whenever you successfully perform an aid another action, you grant your ally a +4 bonus instead of the normal +2.
I don't think Helpful would apply to Caster Support; the bonus granted by the aid another action is typically untyped while Caster Support is a circumstance bonus. That said, its not really something that would be
There are TONS of ways to boost the Aid Another action.
Off of the top of my head:
— Team Up (Combat Feat)
— Order of the Dragon's 2nd-level ability (Cavalier)
— Intercept (Honor Guard cavalier archetype)
— Cloistered Cleric (It has an ability that allows you to use aid another at a 30-foot range.)
— The entire Golden Legionnaire prestige class.
— The Battle Herald prestige class has some nice Aid Another boosting too.
— Swift Aid (Combat Feat)
— Bodyguard (Combat Feat)
— In Harm's Way (Combat Feat)
— Ring of Tactical Precision (Magic Ring)
— Gloves of Arcane Striking (Magic Gloves)
— Perfect Aid (Marshal Mythic Path Ability)
— Sudden Block (Marshal Mythic Path Ability)