the restrictions are not in setup. they are restrictive in how you drive.
your second paragraph is proof of my point. if you like the rush of keeping ahead of somebody, or matching up against another car or driver, you are RACING, trophy or not, and that has no place in driver education. whether you knew it or not, you are already racing. get your license and get out there for real, and quit yanking your norton.
if you don't want to actually race, but you still want to drive on the track, then you should be renting test time at the track, and just measure yourself against the stopwatch, and quit contributing to factors that endanger other drivers. under no circumstances should you be out there with other drivers trying to learn how to drive, and trying to stay ahead of one, catch one, or pass one, in some form of personal competition. that is exactly the one thing you are not supposed to be doing, and something that every organization has to agree not to allow in order to maintain their event insurance.
this is a very common problem, and exactly why insurance is so expensive.
i am getting involved in a movement now that is focused on redefining and restructuring DEs to eliminate passing and other things that lead to competition in what is a school situation. it will force organizations to make the run groups smaller, and more closely matched, using many of the same tools that racing bodies use to separate cars. by eliminating these adrenaline inspired temptations, the schools can do their job of instructing better, and get these drivers out there racing like they should be.
i have no problem with club events that allow passing and such, but they need to call it like it is. it is a race. it is not a DE.
this will also remove the burdon on the automobile insurance companies, who continually get scammed by people who file claims for accidents that happen on the track during "driver education" that were actually things that happened because somebody was out there effectively racing.
the expense to race does not have to be anything more than gas and a small entry fee. that's how it used to be. that is what porsche built its philosophy on. they wanted to build a car that you could drive to work during the week, and then out on the track on the weekend. for that, you need no setup, no special gear, and therefore no added expense. street stock.
it's a slippery slope though, because i promise you that the first time you race will be the last time you bother with a DE.
so, i go back to a DE car and its setup. you are only out there to learn how to drive. you could be in a bone stock yugo, and still learn to drive. there is absolutely no need for aerodynamics, power increases, stiff suspensions, or any of that for a learning course. in fact, you will learn far more easily on a soft rolling car than on anything else. it is far more important to drive smoothly on a track in a minivan than in a miata.