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If you only need one more analog pin, you could move the VSS over to your newly-free pin3.
The buttons are a big waste of analog inputs. I plan to add resistors to mine, and have all 3 (plus a 4th) share a single pin.
Also, if you happen to use a TQFP atmega, there are 2 extra analog inputs available: A6 and A7.
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