I don't like it. Many times I've accidentally deleted a large block stack just because I was trying to copy it. It's easy and risk-free to just drag blocks into the other area to delete them. It should be kept just like that.

EDIT: Also, if a block is too far down so that the dropdown menu hits the bottom of the screen, you have to hold down the mouse to use the dropdown menu.

Hmm… I actually like the “delete” option. I often use a laptop, and when I don't have my mouse with me, the shift-click delete is particularly useful because it means it involves less dragging. Even with a mouse, I like the shift-click delete because it minimizes mouse movements for speedy Scratching. In 1.4, I found this feature particularly nice when creating and deleting long scripts or parts of scripts.

But I agree that accidental deletion can be upsetting. Once the “undo” button is implemented, do you think it could be less of a problem?

For now, there should be (in the backpack) a last deleted sprite/script.