Allow complex filters based on tag combinations.

Often I need to show content that is tagged with a specific combination of tags, or based on the presence of one tag and the absence of another. (e.g. Tag A AND Tag B, or Tag A AND NOT Tag C, ...). Tag filters seem to be inherently OR operations (e.g. Tag A OR Tag B OR Tag C) which limits their usefulness in complex queries.

If I could reuse the Tag field multiple times in the filter query that would help. (e.g. (Tag A) AND (NOT Tag C) [where () denotes Filter Subgroups] )