I personally believe that newcomers to the TT with NO course experiance should be restricted to the number of races they can enter. This would then give them a comfortable learning curve on a machine they would know well by the end of the week.

I think the problem is that too many people bring several bikes with them to try to do every race as they think this will help them learn the course. But causes more problems with qualification set up and also the difficulty of having to do two different sessions on two totally different machines with different characteristics of power, speed and also handling on the same night, to get the times and laps in.

Maybe keeping them to a single machine may teach them more, but then would they come for just one ride? Who knows... but I guess they wouldn't.