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1) Please contact me with any reports or questions.
2) It calculates the spectrum 'on the fly', appropriate to the energy grid
and parameters the user specifies. But it does not calculate the
ionization balance self-consistently. It uses a saved file of
level populations calculated for a grid of optically thin models calculated
with a 
power law ionizing spectrum. So this will not be self-consistent
if your source has a very different ionizing spectrum. Also it implicitly
assumes that the absorber has uniform ionization even if you specify
a large column, which is not self-consistent.
3) Photemis does not take into account continuum photoexcitation unless this is included in the calculation of the population file xo01_detail.fits by xstar. The standard version of this file circulated with the warmabs tarfile does not include this process.