Rather than schedule to put things on the 5th day or the 14th day of a month, we often want to schedule our flows to run on the 5th business day or the 14th business day. I know that the term 'business day' means different things in different parts of the world, but I think it would be a feature that many reporting-oriented departments would enjoy. Let people specify a formula or have a table to go off of for their definition of 'business day' and it should be easy to implement.
I would add a <scheduler> label to this but there isn't one.