I have one sprite that contains 83 costumes and I want to copy them to another costume, and then I should remove the original sprite. I cannot select many costumes and then copy them by drag and drop since multiselection of costumes doesn't work. I think one should be able to select many by Ctrl-clicking them and Ctrl+A (select all) should also work. I cannot move the code easily since it contains many used-made blocks.

I use Scratch v356 in the last Chrome for Ubuntu 10.04 using the built-in Flash.