I Finally get to see the end of this thread. Every time over the last 3 days when i read to the last page and then tried to load the last page, I would loose the connection to enworld and when I finally loaded the page, there were 4 more added.
So my thoughts, I really like what I see so far. I think that any concept can be created withing the current setup. The opportunity cost thing, well it is impossible to say without full access to all the rules, but it seems a reasonable price to pay considering the secondary effect of cross classing - feats.
It seems to be that opening up the complete feat list (and given the greater number of feats available to a character) is a pretty potent option, add in skill cross training and power swaps and you are pretty potent in the seconday class.
The only thing it does not allow is the caster/warrior combo that is as effective (or very close to ) as the rest of the party (single classed) at both classes. That, however, was never on the cards but it seem to me to be the only reason to bring up 2nd edition multiclass combos.
It appeals to the simulationist in me, because if one multiclasses at levels other than first, the power developement is gradual, or fairly so, depending on how many feats you want to swap. It also allows a character like the Grey Mouser, (a former wizards apprentice) from the get go.
I wonder would Gandalf be a Palladin/Wizard?