The crux of the rules debae is who is going to enforce it? The organisers wont so no matter what other riders, bystanders, bar room lawyers who ever thinks any rules are a waste of time and effort.
I used to think that construction rules and regs were essential until i got involved in actually helping to organise events then you realise you cant afford to turn riders and income away. Sad but true.
In racing it's a whole different ball game but dont fool yourself there are more Manx Nortons, DBD34 Goldies and G50 Machies racing than the factories ever made and none of them are to manufacturers spec.
Motor Sport is Motor Sport. The first thing we always did was read the blue book and push the interpretation of it as far as possible then a bit more. Thats the way it always has been and always will be. Learn to live with it.
The only rule that will ever work as Woodie has said is the no stop rule but you cant get observers to enforce it and probably never will.
So what do we do?
Pratically nothing as nothing will work but what the organisers can do is lay out the sections so that there is no advantage at all in hop skipping or any other kind of prating about. This and only this negates the "advantage" of a modified bike, whatever that is. This is the only way you will ever see some of the bikes that allegedly according to many on this site, although i meet precious few riders who express the same views, are languishing in sheds awaiting the demise of the "modern" Pre65 machines.
Downsides?? you will have to accept there will be quite a few riders finishing on 0 marks but experience has taught me that you cant have it both ways. You honestly cant. Make the sections tighter and more technical and the "std" bikes cant compete, the hoppers and jumpers dominate and the whole thing falls apart.
So debate the "rules" about machine construction all you want but without enforcement, which aint gonna happen, it's just all hot air. Sorry guys.