Checked in xsl_suzaku_xis_makeresp, an automated script to build the XIS rmf and arf by calling xisrmfgen and xissimarfgen. Three speed options (fast, medium, slow) use different channel and energy binning schemes as well as different accuracies in the xissimarfgen run. The accuracies probably need a little more tweaking.
The point source option assumes that the source is in the center of the WMAP. Other possibilities here are to use ftstat on the WMAP to get the pixel with the highest value or the centroid of the map. It's not clear which is the best thing to do.
I would like to be able to use the algorithm found by Randall and implemented in xissmooth. This requires turning xissmooth into a general purpose ftool.