On the topic of SMF, this is a very useful tool if it is available at your own unit (as long as it is used correctly by the management). But I would be very wary of using it to try to assess what is happening at another unit. The kit cannot distinguish, for example, between two aircraft, one of which is VFR, or a heli waiting to cross the runway and being watched by the controller. In both these examples the distance between two aircraft can quite legitimately be very less than radar separation.