would be nice to have "# of laps" as an option under difficulty before each race. to incentivise people to race with more you'd earn more credits equivalent to the increase in time invested.
In singleplayer?
Maybe, but I think single-player is just so different from multiplayer in Forza. A race in single-player tends to be won or lost within the first couple laps. Not many people actually try and pick a difficulty or car that makes them 'competitive' with the AI. They want to win races. So yea, the extra money might be an incentive for some, but it creates boring races and I don't want people equating somewhat longer races with boring races.
The problem is that Turn 10 thinks everybody just wants these quick 'bang bang' races online. I don't think it would really deter many people if you bumped up the average race time from 6-8 to 10-12 minutes, though. That's comparable to a match of team deathmatch in Call of Duty, so its not like people's attention spans are that short.
I never understood why these racing sims (not just Forza) need so many cars. I'd love to see the stats on which cars are actually used.
Because people love variety when it comes to cars.
Its also fantastic for online, when you have more than just a small handful of competitive cars to use.