You can do this now by changing the stick mode in the Pilot App. The default Mode 2 has climb/yaw on left and forward/sideways on right. There are 2 other pre-defined modes and one user-defined mode (4) available. There is no roll as such but you can combine yaw/sideways on one stick and climb/forward on the other.
Thanks Scotflieger. Unfortunatly as I am also a mode 2 RC-airplane hobbyist, I can't make changes to the modes. This would effect the intuitive reactions I have developed over the years in mode 2. Otherwise this would have been just the answer I was looking for.
Perhaps I should make a suggestion to DJI for future software that makes it possible to mix two functions in a user defined percentage towards one stick-movement. So when I move the right-hand stick to the left, some clockwise yaw would be added to the movement via the software.
I have achieved something similar of what you seeking by simultaneously putting a left stick yaw and right stick together to fly the I1 along an arc. These small inputs allow me to circle a point of interest while filming.
Rob, I would recommend you to just practice, as much as you can. Sometimes I am just tired of filming in my town and I go to a part and start practicing like for example circling a tree or any skill that you would like to develop. If you wail for modifications in the app I have to say that, the less help I have from the app the better pilot I become.
(if you just want it simpler I saw that the solo from 3dr has circling and cable to help the pilot with this issue)
Obviously just a comment, I love the I1 and more new features to come for it.