[bbx]

Thanks, that's great feedback.

For number 2, that should be possible, since I have the position of each item in the list (and the position of the list itself. Using a <canvas> might be the way to go.

For number 4, my main concern would be that it would feel like "scroll-hijacking". What I did however is prevent the picked item from going beyond the list, in both directions.

Number 5 is a good idea as well, easy to implement.

[cyberrock]

Another suggestion is showing an empty slot (selected item with less opacity and dotted border?) and displacing/scaling the picked item to show that it's been picked up. I would immediately connect it to picking up a book, CD, etc. from a shelf.

I think you should add some kind of marker to show where the item was picked up from and thus what would happen if the operation was cancelled, and an empty slot is perfect for that.