Bought the game not long ago, was giving a run on vanilla before using your mod and this patch came. Will do as soon as you update it, but it seems like a great mod, congrats.
Was reading your changelogs and besides the obvious fixes I didnt seem to find one to something that really bugs me, Marketability.
I just think it is totally wrong the way they do it, on the current state (vanilla at least), any driver with marketability under 70% is completely useless if you want to go for 5 star sponsors (and you want to go!). Marketability formula is pretty simple, you sum all three percentages (Driver 1, Driver 2 and Team) and divide by three. Since 5 star sponsors require at least 90%, no drivers under 70% would be able to get you to that treshold even if you have the other 2 at a 100%.
That also leads to an easy exploit, beacuse I can be the last car on the race and still have the best sponsors. All I need to do is set a lower season target and get marketable drivers. The sponsor payout increase more than makes up for the chairmans payout loss.
In real life, top teams dont go for the most charismatic drivers, they go for the most talented ones. Driver marketability shouldnt be a deciding factor, like it is right now, it should be a bonus. Also, it doesnt really matter how charismatic your drivers are, you are never going to get great sponsorship on bad teams. Sponsors care about exposure and the best exposure is finishing first.
With all that said, I have a couple suggestions if you are interested on adding this and if it is doable coding wise.
1- Increasing the teams weight on the formula 2/3/4x of the drivers. It isnt a perfect fix, its better than now, you would still be able to exploit but at least driver marketablity wouldnt be a deciding factor anymore.
2- Have the teams weight increased and make it that the teams marketability is relative to the constructors championship and not to the season goal.
Anyway, I think that the sponsorship mechanics on this game are completely broke and done the wrong way. If it was up to me I would do it completely different with season long fixed sponsors (even 2/3 years contracts) with bonuses/detracts according to race and championship performances. That way you would have your season budget beforehand, pretty much like real life.
As I said, your mod seems great and I cant wait to use it as soon as you update it, great job!