Unused pins on a quad op-amp?

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If you want to leave room for extras on your pcb, use zero ohm resistors, so you can turn it back into an amplifier later.
 
..does this document take it further?

http://www.maxim-ic.com/appnotes.cfm/appnote_number/1957

..amd what could the R value be, in fig. 1 ?

(I'm using this quad opamp for balancing an output, btw)

=FB=
 
Figure 2 is what I was talking about. The app note kind of assumes that you are using a single supply, so those R's in fig 1 are just equal value, like 10k-100k to make a half supply. But if you have a bipolar supply, the half supply is ground.
 
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