Tag groups as Taxonomy ?

Thanks for your advice,

1) in post edit page, you can see all the tags. When inserting tags cloud on your theme you can sub-select the group. Because ajax is very uneasy, today I have not plan to insert a special metabox containing tags grouped as in plugin settings or in each tag edit page.

2) it is the same reason, but if I have time or if you demand is commercial and can paid service, I can begin analysis and plan addon for that…

Hope that I have understood what you need..

Michel