Since its too late for them to go back and create epic class levels (its also probably cost prohibited) what they should do IMO is grant a new feat on every epic level (this would be in addition to any normal epic feat or destiny feat) and have the character choose from a list of 3 or 4 feat that can be taken more then once. Exaples of the feats would be
Martial Training: +10 Melee Power, +1 BAB, +20 HP
Arcane Training: +2 Spell Power, +25 SP, +1 Arcane Caster level
Primal Training: +5 Melee Power, +5 Ranged Power, +10 HP, +10 SP
It gives the illusion of choice at the very least which epic levels are missing.
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I like this sort of idea. Probably only on "dead" levels though (those w/no other feat). 3 options are not enough, however.
I can be found on Orien as Cilon
HC7: Typhoon, Dreaded Knight, and Wish. HC6: Naivety. HC5: Who Is Here. HC4: Cylon Centurian. HC3: Soulstone in Your Pack. HC2: Carnage