Right now because I have no idea how to implement this feature, this is put on hold. I need to consider both primary and secondary usergroup among with other conditions, so eventually I will need to rework the currently hacky display condition system. Thank you for your interest anyway, I thought nobody wanted this feature. (Please forgive me as this is my first XF addon)
I am currently working on 1.1 which is the importer update (in a few days, I hope), hopefully 1.2 will have this feature.
Good news, implementing this feature is easier than I thought (The methods I need are built-in - thank god). I might be able to roll out this feature in the next version that should be coming this week, that is if the importer likes me