[logback-user] Setting MDCFilter values at runtime

Hi- I'd like to leverage the MDCFilter TurboFilter, but I need to be able to change the "value" element at runtime. Basically, if a specific user is having trouble, I want to set their logs to show up as DEBUG while the remainder of the logs show up as INFO. Is there a way (preferably using JMX) that this can be done via configuration? If not, what's the best approach programatically? Thanks, Dan