1. (most important, for me): Lighter cars, like around 630 kg again. Only this will make the cars look or 'feel' quicker again. More agile moving in car to car battles, in chicanes and everywhere. Later braking, no brake discs at the limit all the time anymore. (Even Ham or Alo said all of this. And its obvious by just watching for me.)
The wheel movement maybe will increase a bit as well again, making it look like as the driver is actually driving and kind of positioning the car.
Cars from '91 - 2009+ look ["feel"] like cars made out of paper (= positive
) for the spectator, compared to the more heavy and fuel loaded current GT-Formula ones.
2. 'No' fuel saving please, everyone -as standing on the grid- should be able race each other in the highest engine mode throughout the whole race, and the engines should be made for this / not breaking down or whatever just of that (can't be that difficult to do so and also not for the hardware, because in a way there is not much difference stress wise).
3. Less Tilke Tracks. Sepang is cool because of the wide track and some corners + corner flow. But the newer tracks with its slow 90° corners everywhere are a grey/depressive-feeling mess. Also they are too plain.. .
Put Imola back in the calendar for e.g., = more old tracks (they have some certain kind of character).
Even the India circuit was not bad with its uphill and downhill passages and else (at least get that track back in the calendar), yes even Korea was not that bad (at least it had its character, with slow, mid and fast sections = more versatile to drive on and watch, than all this other mentioned 90° turning tracks).
4. Maybe less setup restrictions. As far as I remember the max. negative tire camber is limited to a quite low value compared to mid 2000s and earlier rules. Which makes the cars look like driving boringly on rails as well (with their almost straightened out tires)... .