Add Copy & Paste for clips

There is a copy paste button but it doesn't work. Being able to copy clips and drag them around would complete recut for me/ I currently use it to do my initial rough edits and this is much faster than using a standard editing app, the only significant thing I miss is being able to cut copy and paste segments as I move them around. A few times I've used the wrong word, and cut the correct word from elsewhere and pasted it in.