Okay, so if I understand correctly. What was the biggest issues for modders going from 1.6.2 to 1.6.4, Minecraft itself or forge changing its code? I've noticed for example some mods never missed a beat but others just had "fits" when being updated (even if done by the same modder).
And if I understand your predicament. Forge changed its code but you need to be able to use both forge and not need it. So, in a way it seems like you are being asked to do two versions one forge and one non-forge. For those of us using optifine to help us with our huge mod folders and HD graphics, it really sucks because there are no real options. I could use MCpatcher for the HD graphics but I lose the graphic fine tuning I need. With 66 mods loaded the options get limited. Sad part is in order to keep most mods up to date Forge needs updated to 1.6.4.
I'll continue to support you in your efforts. I don't envy your task before you. But I do salute your vallant effort to help all of us to enjoy MC just a little more.
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hope there will be a fix for 1.6.4, the other 2/3 are the huge distances and the overall FPS gain^^.