Thanks for your very good points Hevonen!
1. Yeah, you need to be in Add Clones mode, which is the default mode. Then you just drag downwards to create the “empty” part – which is clones of the blank drawing. I know this is not what you are asking. I do get it – and you have a good point. I will think about it.
2. Grouping layers is something we already have on our todo. Yes, you will be able to export in OpenEXR format as soon as we get it done. We haven’t worked out the details on that yet, but utilising the capabilities of OpenEXR (layers, etc) would of course be preferred.
Yes, exporting in some common vector format is something we are looking into. Also using our internal data structure for more advanced features in future releases – like nudging and otherwise adjusting existing lines. But it will be in an Animation Paper kind of way. 🙂 Keeping it quick and easy and “analogue” in feel.