ok my idea is a grind cascade. You would grind 2 diabolos on one stick and 1 on the other then proceed to do a cascade juggling pattern ... well the post is "crazy ideas" xD.Obviously this would be best with something like wide axle flys.
for 2d on one stick, you'd need either huge sticks, or micro diabolo's, and amazing balance.
Feed the fan
3d in one hand
3d infinite anti-sprinkler is quite possible.It'd basically be doing a anti-sprinkler powered with a 3d anti-shuffle.
i think he's done more than that...
Been done. Dekel did it in a video ages ago. Its the last trick in his feed the suns vid.