Aaaargh, too many good ideas!
If there was one thing that I would identify as crucial in the learning process, it would be 'flying in treacle'.
Many years ago, at Damp in Germany, we were flying Rev 2s as it was very windy! (Before vented Revs were made)
We decided to fly EDIT 'very' slowly and it worked a treat.
iQuad make very good use of speed control but I have not yet seen them flying in treacle!!!