Sorry if this has already been suggested, but the subject line says it all.
As noted in other threads, trying to bend something like Title Enhanced to every possible set of case rules is about the least fruitful activity one can imagine.
This inherent limitation of the grammar rules could be easily overcome, however, if Regex expressions were available in the exception field. This would allow detailed handling of weird case constructs that the NYT rules don't account for.
BRU was already excellent before Title Enhanced, got totally kick-ass when it was introduced, and would be like manna from heaven with the extra Regex functionality. I hope it's something that could be easily added for the future.
Thanks and cheers for making everyone's life a little better with BRU!