Another update on my progress:

I am continuing to work on the one handed roll, and though my speed is still slow, the technique is becoming more deeply ingrained. I have been practicing a lot combining the hands into a single stroke, and focus on slow to moderate pace for most of a 20 minute warm up, then push it at the end. It is a pretty motion the hands get with this technique, looks quite different from my old way.

I'm concentrating on visual smoothness in the strokes and conservation of motion, Jo Jo's 'minimal interference'. I spend part of the time with my eyes closed, 'seeing' with my ears, visualising the evenness of the strokes in my mind, then opening my eyes to compare the actuality. I feel each stroke of the push pull. I work on relaxing the arms, my shoulders, my whole body, and keep the back straight.

This is a new way to move the sticks for me. I will apply it in addition to my old ways, it will give another skill under the belt.

One thing: I over did using my heavy aluminum practice sticks and caused a pain in my right hand that has taken a couple weeks to work out. I've still been loosing it up daily, but not pushing it, and have been taking aspirin or Aleve. Today I hardly noticed it, I think it is finally healing .... it hasn't bothered me in my gigs, I use more wrist there.

I'm using the exercises to become more comfortable playing short combinations of 1/8 & 1/16 notes with my left hand. 

It allows me to play more phrases on the snare drum with my left hand alone, without abandoning the ride pattern that's being played by my right hand.

That's hardly a one-handed-roll, but it's progress for me.