Support for something like "today +3 weekdays" in date parser?

Now that we have support for importing TaskPaper, I think there are some new use-cases for the date parser. The one that specifically comes to mind is the one in the topic title.

I have 3 working days to reply about a specific procedure. If I receive a notification on Thursday, I have to reply by end of day Monday. But at the moment, there doesn’t seem to be a way to identify this kind of due date. I can say its due “today + 3d” but that will put it due on Saturday.

I’m hoping that I just haven’t identified the correct keywords to find a solution to this somewhere else. But I’d appreciate some feedback and thought. If it just straight isn’t possible right now, I’ll forward it on as a feature request.