Chassis / Engines
It did feel like all the new teams that entered during the season did have a unfair advantage as they could see what teams were doing well and the choose a chassis and engine that was near the better teams and unsurprisingly all these new teams scored podiums and wins.
It would be better rather then having absolute ratings, that the ratings should be within a random range, so if say a Ford ED engine has 650hp then it should be written as say 550 to 675hp or a Hart Engine is 700hp then it might get written as 600hp to 750hp just to make it more random.
Maybe new joining teams could have a slight power or chassis disadvantage for a few races as it is rare for new mid season joining teams to have such good luck

Reliability / Power
Do I have to point out that Foxdale and Sunshine were the fastest teams on the track and both had horrible results, with too many DNFs. I can point out that Douglas Manns Win and Shinobu Katayamas 2nd place only came about as both cars could pit before electrical failures could retire them (Foxdale have no other results apart from that and Sunshine have 2 5ths...). Also at the bottom end of the field there were DNPQs a plenty.
It would be good if say every 4 races, teams could sacrifice power or chassis performance for reliabity or for the other end, sacrifice reliability for power or chassis performance. I am sure a top team would not allow so many DNFs to happen if they have the speed to come first and I am sure some of the bottom teams would ramp up engine power to at least attempt to qualify. To stop it being to much of an advantage it would be easy just to have a few settings of minor, medium, major changes with adverse effects on performance or reliabiltiy or just allowing teams to implement it twice at race 4, 8 or 12...
Qualifying
Although will hurt me personally, I think the top ten teams should go into qualifying proper with everyone else prequalifying, maybe if there are too many teams, then maybe all the new teams or teams that DNPQed all season should have pre-pre qualifying to whittle down the field a bit so that prequalifying is more a battle. Halfway during the season, the pre-pre qualifiers should change with teams that have not managed to prequalify with ones that have managed to get better results in pre qualifying. With the normal top teams going into qualifying and the slowest bunch going back into prequalifying.
Points
Should be the new old system of 10-8-6-5-4-3-2-1 so it is more challenging at the rear end.
News
To spice the drama up, all teams should be allowed to post at least one news story about another team. Like I did with Kay Lon (more then once, whistles....), sackings and drivers swaps make this game a bit more fun.
Super Licence
To stop slow drivers or robots from entering, there should be a super licence and all drivers should post (if they haven't already, and let's be fair most have) their early history whether it be in F1, Indycars, F3, F3000, GT Racing, Le Mans, IRDU, Formula Nippon, etc on the Wiki


Anyway those are my suggestions. I hope some of them get taken on board, esp the power / reliability one.