It's helpful to be able to restrict searches by product as well as component. I made a quick patch, strongly based on treatment of the component option. It seems to work quite nicely.
Created attachment 97326 [details, diff] 0.6.11-add-product-option.patch
thanks for the patch, i've added this to the svn for pybugz, will be in the next release, hopefully in the next couple of days.
This is fixed in svn.