I have some rough, general data.
Outside of QB, your average skill player has a percent of fumbling on any attempt (catch or rush) that is just shy of 1%!
KR/
PR specialists are about double that figure so we can correlate their is about double the chance of fumbling on a special teams run.
QBs fumble on rush attempts about 5-6% more than their offensive skillset partners (RB, WR, TE). That number doubles on average for sack-fumbles which presupposes a year-to-year sack-fum% of 10-12%.
If you take the total average of sack-fum% and rush-fum% you are looking at a general total QB fum% between 15 and 18% on average year-to-year.
I, for this reason supported above, prefer to use the Intentional Grounding penalty slider around this perimeter of 15-20 as it concerns the QBs ability to avoid sacks (and picks). Of course, you can directly impact fumbles universally through the fumble slider and tackle slider.
A Madden blogger has some insight on fumble percentages here:
http://maddenmanniac.blogspot.ca/201...y-car.html?m=1
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