Multi-block selection / copy / cut / paste

[ghost]

To delete several blocks, one has to click the Delete button then OK button for each block, one by one. It can be tedious. It would be nice to be able to select a span of text across multiple paragraphs, with the mouse or keyboard, then press Del key. But text selection is presently limited to a single block:

It gets worse when you want to move text to a different scene: you need to select a block's content, copy, delete it, switch scene, create a block, paste, switch back and repeat for each block of text.