Jon and Jared
I totally understand you ideas of "blue flags". Speed differential has always been a concern in the club
The problem I see with waving a flag at a slower rider to move out of the way of a faster rider, is that from the beginning the MRA, HPR and ever other race/track day org I am familiar with places the responsibility to pass with the overtaking rider. We are to hold the "line" at all times.
By now instructing a slower bike/rider to move out of the way when a flag is shown goes against what is the standard practice of riding/racing on the track...Too me this is asking for too many problems.
IMO Jon's suggestion for minimum engine displacement is a better idea (even thought there will still be slower riders, etc..)