Alternative drill moves
If you have a drill, where there are two (or more) moves playable - for example in the Advance Caro 3...Bf5 - it would be nice to add something that says - this is also a fine move, but I recommend something els. Also in some middlegames drills, there could be 2 good moves (e.g. one is + 3.7 and other one is +3.6), but the other one is "incorrect.
I know Levy has already worked with it on Chessable in his 1.e4 course, and I think it is a very nice feature.