I know the 1st ed rules for these and never liked them - chaplains were too powerful and captains no different to a sergeant.

With no chance of changing the timer I have thought about a couple options for other wargear and character options. Let me kno which ones you like most please.

Chaplain
Option 1 - +1 Close Combat, Reroll CP (As Sergeant), Storm Bolter, Crozius

Option 2 - +1 Close Combat, +1 CP (Max 6), Storm Bolter Crozius

Crozius - As Power Fist or as Thunder Hammer? (No bonus, +1 Bonus)

Captain
Option 1 - +2 Close Combat, Reroll CP, Storm Bolter, Power Sword or Power Fist and Grenade Launcher

Option 2 - +2 Close Combat, +2 CP (Max 6), Storm Bolter, Power Sword or Power Fist and Grenade Launcher

Grenade Launcher - As Psychic Storm Area Effect, 6 Ammo. 12 Range. (Actually same as Flamer but not persistent and kills on 4+)

Cyclone Launcher - (personally I don't intend to use this but like to be complete!) As flamer but unlimited range, 12 shots, not persistent. Counts as two models - you replace the heavy and another model to have this model.