I had a stray thought reading the recruitment thread when Pathfinder posted about a racial substitution. Would it be possible for me to trade the Crusader's 6th level special feature (Smite 1/day) for the racial substitution of Purifying Strike? I'll write it up below.
Purifying Strike (Su): Beginning at 6th level, a kalashtar crusader can use the essence of his quori soul to drive out malign forces manipulating the minds of others. The crusader must first make a successful touch attack against a target creature. He then spends 3 power points in order to make a dispel check (using his crusader level as his caster level) against each mind-affecting spell or ability influencing the target (though he can't choose to ignore some effects and dispel others). If his dispel check succeeds, the effect is dispelled (as by dispel magic). Effects that are immune to dispelling can't be affected (except as noted below).
The purifying strike is also treated as a dismissal spell for the purpose of exorcising a quori spirit inhabiting a target creature. The save DC for this effect is 10 + the crusader's class level + the crusader's Cha modifier - the target's HD.
This substitution feature replaces the standard crusader's smite ability. A kalashtar crusader instead gains that ability at 17th level, usable 1/day.