I know nothing about programming, but here are my two sense:

Would it be possible to figure the rate at which it does repeat and simply have the system blacklist it so it only hears every 4th. or 5th. or whatever you need? (This appears to be your actual question, that is hardware-ly impossible)

or

Would it be possible to have the program only be able to accept input at an interval, say every .5 sec. So, even if the program receives a million strokes it can only respond to one every .5 seconds?

/IDK, these might not even make sense in a programming sense