Kind of like Divine Remix's idea of "No unkitted Clerics--you've gotta pray to somebody?" Yeah, I can see the arguments for that, though I personally am in favor of allowing people to roleplay Clerics that follow gods not available through DR or Ashes of Embers--let them pick the god, give them access to every spell, and let them choose their own spell-sphere access.
Same with Paladins, in my book. I coded up a little basic unkitted Paladin template, where Neutral and Evil paladins get (respectively) Detect Extreme and Detect Good instead of Detect Evil, PfExtreme and PfGood in place of PfEvil, and "Life Siphon" and "Bloodspill" abilites in lieu of Lay On Hands. Life Siphon deals 1hp of damage per paladin level and gives it to the paladin (cannot heal beyond caster's maximum), and Bloodspill just does 2hp of damage per paladin level.