Of course the only ultimate solution to "replace bad vendor query" is "replace bad vendor." 😀
You can set up a trace with a high threshold(s) to capture really bad queries. Then try to track back to where they came from 🙁 ... won't be easy, but don't know what else you could do.
SQL DBA,SQL Server MVP(07, 08, 09) A socialist is someone who will give you the shirt off *someone else's* back.