This could simply be an additional free text field in the "User Defined Flags" window labelled "confidence" OR the user is able to define their own but they are limited to 5-7 options.
The benefit is that when users pick up a model they better understand the confidence associated with each flag. Generally the "Description" field is currently seen as a "source" field. The users can then use SQLs / Ruby to build their own model confidence tools as they see fit while allowing greater transparency and functionality.
