Question: If a Synthesist combines with his Eidolon and it has the swim evolution, can it use the webbed hand to cast, or does casting require normal hands?
Unless it says otherwise, I think it can. It doesnt actually eliminate your hand.
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Remember that you're not exactly "combining" with the eidolon, you're sort of wearing a spectral eidolon suit. You don't lose your own hands.
"A synthesist summons the essence of a powerful outsider to meld with his own being. The synthesist wears the eidolon like translucent, living armor. The eidolon mimics all of the synthesist’s movements, and the synthesist perceives through the eidolon’s senses and speaks through its voice, as the two are now one creature."
Emphasis mine.