On mobile this is a strong contender for the worst UX I've ever seen. The whole page moves, so you have to continously scroll back up after placing something.

If when in pick mode you would only scroll the list, I would be able to organize it much faster.

> On mobile this is a strong contender for the worst UX I've ever seen.

Pretty hyperbolic. First of all, this is a human and their work you’re talking about. A little respect goes a long way. Secondly, if this is the worst UX you’ve ever seen on mobile, I have to assume you’ve only been using the internet for the past week or so. This experience worked great for me on mobile Safari with no instructions required. You can’t say that for a lot of mobile UX including, I might add, Safari itself.

It's even worse on desktop. You have to scroll the entire screen (with mousewheel or arrow keys) to move the selection. I spent 30 seconds thinking it was bugged because the intuitive solution would be to click once, then simply click where you want to place it, but the "place" button only showed up on the one you already "picked". Fine idea, worst conceivable execution of UX I have ever seen.

Perhaps a combination of the two? Maybe standard drag-and-drop works as usual, but if you drag the item to some deadzone (like the side of the screen?), it will stick and you're free to scroll to where you want to put it.

Scroll up to what? The whole list fits on screen for me

Surely you're being hyperbolic. I've seen some atrocious UX before. Maybe what you mean is it's a good idea but the scrolling part should be list-based instead of page-based.