As far as taking shots in the dark goes, I did have another idea regarding various real-world courses. My guess is that the following courses could be really good additions for GT League events:
-Silverstone & Spa-Francorchamps would be ideal for the Gr.1 Endurance Series, as I'm very sure both courses have popped up in the WEC series multiple times. Daytona would also be a great addition, mostly if the mid-field layout would be included.
-Fuji & Twin Ring Motegi would be good for the Gr.2 series.
-Meanwhile, Laguna Seca & Sonoma (the latter being previously known as Infineon and Sears Point) would be good as another Gr.3 endurance event, or perhaps for the Porsche 911 endurance event. Either-or.
-The Red Bull Ring, if it returns, would be a no-brainer addition to the Red Bull X2014 Jr. series.
-Ascari Race Resort seems like it'd be good for the Premium Sports Lounge, as "lounge" and "resort" are two words I typically associate with each other, haha!
-Indianapolis would make for a good race in the F1500T-A series - I think that car would be a good stand-in for actual licensed Indy Cars for now. (On that note, Twin Ring Motegi could be good here, too, as I think it's also an Indy Car track.)
-If Monaco returns, it will be a race for either the Red Bull X2014 Jr. series, the F1500T-A series, or ideally both.
For original circuits returning, here were my thoughts:
-For tight city circuits like Madrid or London, I think it'd be ideal to restrict those courses to appear in events that feature lower-powered cars, like the FF challenge. Maybe N500, tops.
-Idk what should be done with Goodwood, unless there's a way to facilitate that sort of gameplay. I'd personally love it, to have these sorts of time trials be around, especially with the Isle of Man WRX, or that time attack HKS Lancer Evo IX. On a similar note, drift trials could be around, too, with the drift-spec BR-Z and the 370Z that's going to join it. It'd also gel well for the drifting cars that've previously appeared in the GT series if they returned, like the D1GP RX-7 FC.
-If Sierra Circuit also returns, maybe it, too, should be part of a time trial sort of gameplay, where you try to get a certain time around the circuit - much like how the Isle of Man WRX did so at that real-world course.
-I'm not sure if Special Stage Route X is really needed, tbh, nor Special Stage Route 7. I suppose both could still have potential, though, especially the latter as a real big super speedway. I think SSR7 could be good for an endurance event, too.
-As for everything else I didn't list - such as Tokyo R246, Toscana, Swiss Alps, NYC, Hong Kong, Special Stages 5 & 7, Deep Forest, Trial Mountain, Rome, Apricot Hill, Midfield, and so on - I think that there's more flexibility with those, and could be applied to a variety of events. Both ones that we see now, and ones that could be added in a future update.
Personally, I want to see more endurance events, and potentially ones that go beyond one hour, but no more than three, maybe four if you wanna push it. Maybe 1.5 or 2 hours, instead? Here were my ideas for potential endurance events:
-To preface, I think it's likely that when more events are added, they'd need to have a broader sort of motif, as opposed to individual events like "Suzuka 1000km," though I think there could be an event that has a race just like that within it, rather than it acting as a single event with a single race.
-The Roadster Endurance could return, and could have races at Tsubuka, Streets of Willow, and Tokyo Expressway East Loop.
-A Gr.2 Endurance series could appear, with the older "Fuji 1000km" and "Suzuka 1000km" appearing here in effect. I.e. there would be a race at each course with a lap-count that would still total to 1000km at each course.
Other event ideas of mine include:
-The Beetle Cup, but it's a one-make for the Beetle Gr.3.
-Return of the Shelby Cobra cup.
-The 206 cup, but instead, it's actually the 208 cup.
-The Megane cup, but it's limited to both Gr.4 Megane racers.
-Pan-Euro Championship (limited to European cars within N500, both tuned and de-tuned)
-La Festa Italiano (limited to Italian road cars in N600, meaning the 512BB and Pantera could compete with a de-tuned Veneno)
-All-American Championship (limited to American Gr.4 cars)
-British GT Series (limited to UK Gr.4 cars)
-Renault Alpine Cup (limited to both iterations of the Alpine A110, an N200 event)
-100HP or less! (This would mean de-tuning most N100 cars, though some N200 cars could be de-tuned for this as well. Though the poor Fiat 500F can only get to around 50HP at most, haha!)
-If a future game has the Suzuki GSX-R/4 Concept return, and potentially adds the Yamaha Sportride Concept, maybe those two could race alongside the Honda 2&4 Concept as some sort of event that focuses on concepts that integrate an automaker's history with motorbikes.
Other notes:
-Why didn't they call the Nissan GT-R Cup "Race of the Red 'R' Emblem"? And why didn't they call the Competition de France the "Tous France Championnat"?
-For the latter, could it be because most of the races in that Gran Turismo 4 league were actually set in France? Maybe using a different name in GTS allows for a bit more freedom with potential courses, and re-using the name without having all-French courses would break the motif.
-And for the former, maybe it's because that event focused specifically on the Skyline & Skyline GT-R, whereas the Nissan GT-R Cup has an emphasis on the "GT-R" part of the label? Looking at the eligible cars in GT4, there do seem to be some non-GT-R Skyline models that are eligible...
EDIT: One last note. If the Lexus IS-F CCS-R returns in a future game or update for GT Sport, I think it'd be quite at home in Gr.4.