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@Wingedangel
I rode on bio pace for a couple of years, I can't remember it feeling that different...the shape isn't massivley eccentric, it's only mildly kinked. It wouldn't have any bearing on anything, otherwise shimano wouldn't have introduced it, have to change everything else if your chain ring was biopace would be commercial lunacy, I can't see them doing it if it was going to affect anything drastically.
I am about to put biopace rings on the lemond I'm converting for a mate, I haven't ridden it yet as I need a chain tensioner, though if they are weird I can easily find some 130 bcd rings.