Yes I would love copying and pasting code too! It would save a lot of repeating dragging code out.
I didn't think of only copying and pasting from your own projects but if we are able to transfer code from other Hopscotcher's projects it would be useful, for example if they had a feature that you would like to use in your project.
Like the feature might require a lot of code to program, and you could remix the person's project I guess, but you're might be mostly making your own unique project with only that feature from the other person's code, and maybe you'd like to make it from scratch. Then you could add that person's code in when you need it and tweak it for your project.
Unfortunately I do see how people could just copy other projects though and without giving credit, so copying and pasting only from your own projects is the best way I think as well. This is an awesome feature anyway!