I've heard this being the secret weapon of all top-scorers. Not that I really care about topping the leaderboards, I'm just curious. The only time I've tried it I failed miserably. I never could keep a Jackpot alive long enough to actually score with it. Or if I did, it was only because I ignored the Flame Notes entirely.
I can do Jackpot/Blast Notes or Road Rage/Flame Notes (the former for somewhat less note-dense songs, the latter for ridiculousness like TTFAF). But I can't see how Jackpot and Flame Notes can both be exploited to full potential on the same run. Is it just an inherent gulf in skill? That's fine if so (like I said, topping the leaderboards doesn't really matter to me...I'm happy just to GS most of my songs).