I managed to work around some of the issue by creating a custom adjustment that foreces attack bonus and saves to what they would be at level 20 and then adds the epic bonuses. This works and prevents iterative attacks from going up.
The big problem - and I am sure this is why it hasn't been done yet - is that everything is hardcoded for level 20. All the classes have a maximum of 20, so you can;t selexct another level once you hit 20 levels in a class, and the arrays that hold special abilities spells, etc... have a hard upper bound of 20 (well 19, actually, since they are zero based arrays). I actually was able to get a caster up to 21 level through prestige classes, and as soon as I added that 21st level I got an amazing amount of array out of bounds errors...
So, being a developer, I can appreciate how difficult it will be to go back and retrofit epic levels into hero lab. Can I get some kind of indication as to how likely it is that this will every get done?