What is it that makes D20Modern classes weaker than D&D classes? Is it the lower saves, the generally lower BAB, or perhaps the lack of direction from the beginning? Is it the fact that the "capstones" aren't tremendously powerful, or maybe all of the abilities are lackluster? I used to think the class bonus to defense, and the sheer number of bonus feats modern characters receive (they make fighters cry themselves to sleep) worked well as a balance for the two games. Having gone back and read my Modern collection and my D&D collection side-by-side, though, the difference is a lot clearer.
Now, before the bashing happens, I'm not powering up Modern classes for a Modern game. That'd ruin the feel unless you want to play a superhero game, which Orion has already done a fine job taking care of.
I'm trying to create general (or specific if need-be) power-ups for D20Modern for instances where Modern and D&D collide, whether it's the astronaut plane-shifted on an experimental mission, some poor guy pulled off into another world by a wizard claiming he has a destiny, a clash of modern and magical cultures, or any number of situations.
My ideas are as follows:
1. I could simply up the Modern characters' saves and BAB, eliminating the Normal saves and replacing them with Good saves, pushing Fast, Tough, and Dedicated Hero to full BAB, Smart and Charismatic to 3/4, and giving some other bonus to Strong Hero. I'd adjust the other classes likewise (except the current brokenness that is Martial Artist... probably the only class in Modern that can show up it's D&D counterpart if built/played correctly.)
2. I could power up the base classes' talents, and the advanced classes' abilities.
3. I could make templates for each class like I did with the D&D Core (plus two) classes. Note that these would NOT be balanced against my D&D templates. That would be rediculous (or would it? Discuss if you like)... If I end up running a cross-over campaign, I'll be powering spellcasters down a bit.
Note: I'm not abandoning my other projects. My brain project-jumps a lot.