If you wanted to do something intresting, if you give the chaplin one lightning claw he can reroll his wounds and the enemy gets no armor save, plus on the charge he can reroll his misses. Its the equivelent of giving a regular character 2 lightning claws, for the price of one. Usually it does some damage, I run the master of sanctity w/jump pack and lightning claw, with the death company. Generally it destroys MEQ squads. Just a thought.
Considder also, 2 baal preditors with heavy bolter spontoons make lethal short range veichles, because they can move 6 in and still fire all of their weapons.