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My First Question

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I was hoping for a 4x4 keypad but this one will work for now(I can just add user interface buttons right?).

The logic for the keypad and the additional "user interface buttons" will be different. You have to "scan" the keypad for input, but the additional inputs could use interrupts. But, yes; you can just add more (provided you have more I/O pins available).


Also has anyone used a commercial LCD like one from an old photo frame?

Remember, you're talking two different LCD types. The one you linked is a character LCD, those from photo frames are graphic LCDs.

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