You know, this really is a big project. I just did a search through the 3.7 files for "taglist" and found several functions that deal with the list and they all "explode" or "implode" on the comma - fetch_valid_tags and insert_tags_thread (I think this one inserts the comma) and rebuild_thread_taglist. Those three are all in functions_newpost.php and you would have to make all the same sort of changes to all those functions. I also found the file threadtag.php. I'm not sure what's in there, but I would guess there are changes to be done in there also.
Are you sure no one has tackled this before?
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