I think it would be great to be able to insert a block above an existing block instead of having to insert a block at the end and use the "move up" arrows to reorder an exercise.

I find this when I have prewritten programs where I may want to add a certain warmup for a specific client I have to go insert that warmup at the end of the workout and use the up arrows several times to move that "prep" block to the beginning of the session.