We already have the following meta questions for establishing tag scope:
The former is a static classification, while the latter focuses on the changes that occurred over time.
Should we also institute tags for context- or geographic-specific variations of Latin? The particular example that comes to mind is ecclesiastical-latin, which I think should be kept since it's such a major division of the language. In a comment, Nathaniel also proposes vulgar-latin.
For geographical variations, per the Wikipedia article on Latin spelling and pronunciation (italic formatting in original, bold added):
Because of the central position of Rome within the Catholic Church, an Italian pronunciation of Latin became commonly accepted, but studies by Frederick Brittain (published as Latin in Church; the history of its pronunciation) show that this was not the case until the latter part of the 19th century. This pronunciation corresponds to that of the Latin-derived words in Italian. Before then, the pronunciation of Latin in church was the same as the pronunciation as Latin in other fields, and tended to reflect the sound values associated with the nationality of the speaker (Brittain, Latin in Church; the history of its pronunciation).
It seems like individual tags for geographic variations would rapidly get out of hand. Perhaps a catch-all such as geographic-variation would be appropriate?