Page 31 of the Poser 11 PoserPython Manual - basically it's just the four most common operators, i.e. +, -, ×, ÷ (the latter either as divisor or dividend), plus a key/value pair option (which uses some sort of spline interpolation, with no option for linear) and a Python callback option (which appears to be spurious as a valueOp because simply setting up a callback via script does that job). I did google for alternative modulo algorithms, but none seem possible using valueOps, even the one you suggest - no 'floor' operator (the best result was this - 755.pdf (iacr.org))

It appears that writing a small Python callback is going to be the best way to do this.

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The 3Dcheapskate* occasionally posts sensible stuff. Usually by accident.
And it usually uses Poser 11, with units set to inches. Except when it's using Poser 6 or PP2014, or when its units are set to PNU.

*also available in ShareCG, DAZ, and HiveWire3D flavours (the DeviantArt and CGBytes flavour have been discontinued).