I do admit I'm also a bit puzzled by the lack of some regulations for some events, and given that the GT Cup Gr.3 events were effectively "ret-conned" into being BoP events, I wonder how else PD could change the regulations for other events? Here were my ideas:
-The Gr.1 Prototype Series would limit eligible cars to those that are actually in Gr.1. But I don't really have a preference whether BoP is enabled, or if there's a 950PP limit.
-I always found it a bit odd that the Sunday Cup Classic doesn't really do something similar to the post-launch Alsace One Hour race does, wherein you'd only be able to enter a car from 1979 or earlier. Or at least something that gives the event some definition, especially compared to the Historic Sports Car Masters and Neo-Classic Competition events. It clearly seems like the Sunday Cup Classic is geared at historic models with less power, like the Mini Cooper or Citroen DS, so why not have some sort of regulation for that? (EDIT: Oh, right, I think it's because these races are required for one of the first menu books in the game, so I suppose they can't be too regulated. Still, making sure you're actually entering a classic car would be nice.)
-I can't remember if the GT Cup Gr.4 races were also changed to have BoP on. I don't see why they shouldn't have BoP, if only to further differentiate them from the WTC 700.
Also, I know most cars that the AI uses in the WTC 900 are from Gr.2, but I do still see some JGTC-era GT500 cars sometimes. I wonder if, in spite of technically being Gr.3 cars, they could truly be tuned to 900PP? If so, it sort of reminds me of how the Toyota Celica rally car has a relatively lower amount of power for a Gr.B car, but when BoP is on, I think its power goes up notably.
EDIT: I also just realized there's no Ferrari Circuit Challenge race at Monza. I wonder if such a race could be added upon the addition of another Ferrari road car? Heck, why not throw in a race set in Japan, too? Especially if the SP1 returns.
EDIT2: Also, I'm truly curious as to what the next set of Weekly Challenges could look like. Even in the worst-case scenario, it could be that PD simply wanted to change the day of the week that they get refreshed. But I would totally be down with a larger variety of challenges, like maybe if all five of them were "Special Events" so that you don't have to potentially repeat races you've already cleared. Especially if they have interesting regulations, like the Alsace One Hour did.