Here are my answers:
a) You could set different opacities to the five states of the RadCoverFlow items in their control template: left-most, left, center, right, right-most. The control cannot gradually change the opacity of its items, though.
b) This is currently not possible, but as far as I can remember, we have received this feature request in the past, so most probably it is a good idea to add a property that will control how many items will be visible on both sides of the selected item.
c) You could use the ReflectionStartAlpha property for that. Does it work for you?
d) This is something we want to implement in the near future. Actually, it was in our plans for the initial release of RadCoverFlow, but we had no time to finish it.
e) This is achievable to some extent using the states of RadCoverFlow item, but you will have only five item sizes.
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