john Thank you for the feedback!
I plan to add some of the features you mentioned (multiple diagrams in clipboard, more options for Existing shapes, dangling lines), although they are not my priority now. As for the "drag-to-select", I want to rework or improve selection, but I still don't know how it should look like. Thank you for the suggestion, I'll think about it.
I'm always resizing objects to their minimum.
In the next big update I will add more features for editing shape sizes (default size for shapes, applying shape size to multiple items and some other). May be you will find it helpful.