Just looked at the ongoing new version.
The intention of the counter was to be placed in Settings/Language/meta_description, as this is the most importent description for the site and read by the search engines.
I never thought of the pagedata description. Of course it would be useful there too.
The present implementation doesn't seem to work on my machine: "Description:[0]" is now visible and doens't change when I enter text. Not even after clicking submit. Only after going to another page and coming back to the description tab is the number of chars indicated. However usually one doesn't go back to this view, because one thinks the job of stating a specific description is finished.
cmb wrote:a) adding a counter for all textareas, (b) hard coding an exception for the meta description only, or (c) introduce a new type in metaconfig? I'd prefer (b) or (c).
Yes (b) or (c), I tend towards (b) as this seems to be rather special and limited in scope.