mod on expressions

Added by: ~jmichae3, 2011 III 01

I could not perform MOD on expressions. please make this possible. I was trying to do calculations with feet and inches. using sums and multiples of 12. I could not use raw numbers easily, which was the only thing that worked.

I would really appreciate this kind of faeature.
thanks.

BTW, what is % for if mod is modulo? must be for percent?