We have the case where the usage of the Products.PloneGlossary glossary should be limited by content-type (which is working out of the box) and by path (glossary should be used only for /one/part/of/my/plone/site). Is there a way to do this?
This seems configurable out of the box. In the configlet make sure "Use glossaries globally for all content?" is unchecked: then put your glossary in the path where you want it usable, and put an empty glossary at the site root.