Hi Eric,
The following sort of works;
_gaq.push(['_setCustomVar',1,'shopLevel','Production',3]);
_gaq.push(['_trackEvent','Shopping','Database Level',]);
I can use CustomVar 1 in an advance segment but it shows the values as 'shopLevel' rather than 'Production' which is what I hoped for, still it is usable.

But to save time I have decided just to create an advanced segment on Host Name which gives me a similar result but without messing with custom variables. Nice of you to include it in the module though, I may need it in the future.

Regards
Mark