Can the DFM rule be expanded/or have more additional rules?

Typically if a user needs additional DFM rule they let us know what type and we add it directly into the DFM Checker rules. However, I'm positive we could allow the user to define their own DFM rules. If possible could you provide us with an example DFM rule that you would like added into FAB 3000? We'll discuss with our colleagues if there is an easy way to let users define their own rules, but for now the easiest method is to simply let us know what DFM Rule you would like to have.