I think class/level has to be part of the mix. Just a quick question though.
• Would it be possible to have both (that is a simple class/level system and a finer grain, skill set system) working side-by-side, and in synch?
For those that wished cleaner/easier/quicker, class/level could be picked straight out of the book (NPCs too). And for those that wished for greater detail/complexity/choices well they could get their fix as well with finer grain levelling. I don't think a point system would ever feel like D&D. However, if you had a choice of:
[select class]
or
[select a "Primary" skill set (focused on class skills be they martial, divine or arcane), a "Secondary" skill set (focused on non-combat and character skills) and a "Special" skill set (any of the above or more)], then I think that would be cool.
Just as the attribute increase in 4E goes to two different attributes (encouraging breadth rather than just depth), I think it would be cool if you could do this for levelling and combat/non-combat skill sets. Rather than reluctantly choosing a combat "skill/feat" because it is going to be more useful over a non-combat skill/feat that develops the character but is going to be less used, you get to choose one of each instead. A finer grained skill system would seem to support this. I suppose the question is, "Would this still feel like D&D"?
Best Regards
Herremann the Wise