It must be very difficult to ensure the fastest drivers are called through consistently with just one ref - I don't envy their job.
For what it's worth, being a middle of the pack F3 I found it very helpful both when leading or being lapped. As already pointed out, the lower heats need this help more than the faster experienced drivers.
However, I'd rather there was no calling through than inconsistent calling through, that way everyone is in the same boat. At the Nationals a few years back you'd be called past for half a race, but on the next lap a back marker would take the lead car out whilst the ref's attention was diverted to ensuring that 2/3/4th place cars didn't hit each other.
At regionals & club nights drivers shout warnings to each other which is good, but I don't know if this is acceptable at the Nationals with the rostrum being a "quiet area".
Finally the Kidderminster scoreboard was an ace idea. Would also be great if tracks had a second loop at the end of the straight and the AMB software calculated speeds down the straight - bit like the tennis ball radar at Wimbledon
