Yes, he's gotten his act together, the last 2 games, but the Bills game he was still bad. Not as bad as the 49ers game, but still bad. He still showed the bad throws and bad decision making skills. And the way he runs with the ball, it's no wonder he doesn't have more fumbles on his runs.
In Cam's defense, I really can't think of a "known running QB" in the last 20 years who would actually SECURE the ball during the entire play they were running. Generally it's the ball not tucked away and someone comes from the side or behind.
Out of curiosity, looked at the stats
Esiason (who for some reason can't stand as an announcer) 123 fumbles in 13 years = 9.46 fumbles per year
Elway 137 fumbles in 15 years = 9.13 fumbles per year
Favre 166 fumbles in 19 years = 8.73 fumbles per year
E. Manning 125 fumbles in 15 years = 8.33
McNabb 95 fumbles in 12 years = 7.91 fumbles per year
Vick 98 fumbles in 14 years = 7 fumbles per year
Cunningham 105 fumbles in 16 years = 6.56 fumbles per year
Newton 58 fumbles in 9 years = 6.44 fumbles per year
Brady 126 fumbles in 20 years = 6.3 fumbles per year
Of course what the stats don't tell you is if the fumble occured in the pocket passing or running.
That said, the assumption is Newton, Vick,and Cunningham were making more run plays downfield themselves than Brady.
Point is I know th feeling of screaming "secure the ball" when I see a QB running down field and the fact that Cam really doesn't fumble that much being at the QB position and he's a known runner.