Bear in mind that you only ever have 4 encounter and 4 daily powers, so having 1 of each from your second class is a lot. Also, with paragon multiclassing or a paragon path from the second class, you get another 1 of each - giving you 2 from second class and 2 from first class, so you are pretty much able to fully multiclass (if you want to shift the balance the other way, pick the second class as primary).
I don't think you can swap out the paragon multiclassing powers, but it does seem a little gray (the rules forbid swapping class features and powers granted by paragon paths, but nothing explicity refers to paragon multiclassing as a path - in fact, it says you give up the opportunity to take a path in exchange for it).
EDIT: That said, I do think it would be nice if, in exchange for losing out on the paragon features, you got one of the features of the second class in addition to the at-will. That would give you at least a chance to play someone who had both sneak attack and spellbook, for example.
I don't think you can swap out the paragon multiclassing powers, but it does seem a little gray (the rules forbid swapping class features and powers granted by paragon paths, but nothing explicity refers to paragon multiclassing as a path - in fact, it says you give up the opportunity to take a path in exchange for it).
EDIT: That said, I do think it would be nice if, in exchange for losing out on the paragon features, you got one of the features of the second class in addition to the at-will. That would give you at least a chance to play someone who had both sneak attack and spellbook, for example.
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