When you shoot RAW (what you should) the setting of WB is not important (unless you want the preview on your LCD to be correct).
Yes, I appreciate this. I was just thinking aloud that when shooting the colour checker (unless you are recalibrating for each shoot - which may be useful for your workflow, but isn't my approach) it is probably worthwhile trying to maximise the data in each colour channel. Fluorescents usually have a spike in the green part of the spectrum requiring that the green channel is pulled down during rendering. In terms of exposure this means the r and b channels will get relatively less exposure if the green isn't to be clipped, and so have less data to work with.
Simon Tindeman's script allows a starting estimate of D50 or D65 for WB, and I think the suppporting documentation suggests that these are preferred unless you do a lot of shooting in other conditions.