When I make games I’ve been in a situation where I need to clone a level. This might seem useless but I’ve really needed this a few times and I think it’s a small thing that flowlab needs.
I wholeheartedly agree. @grazer could you please at least consider this?
One potential bug I could see coming out of this though it the block IDs. Make sure to change those! 
I was thinking more like how you can clone a game but have it so you can clone a level.