When using MovableType’s new tagging engine, viewing entries by tag actually enacts a search across the blog for said tag. The functionalilty works in a similar manner to MTs local search - even using the same .cgi file - only instead of the query being captured within the ?q= element, the tag is wrapped up in the new ?tag= element.
With this in mind, how hard would it be to change the Local Searches pepper to allow users to set multiple Query strings within the preference pane, perhaps in a similar manner to the ‘multiple’ settings now employed for Secret Crushes. e.g. q|tag. The Path setting would remain same for both types of search on MT.
With this change we should then be able to view all local searches - by query string or by tag when running MT.