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You're right. We'll change to "Ctrl". No one really knowns why "shift" was chosen :)
Please use "Shift" instead of "Ctrl". Maybe we should add "Ctrl" as well?
We're thinking about it. Reverse and forward engineering running just like in a desktop application, a dream :). JWS or applet is not an option. I treat it as obsolete technology. Chrome extension + kind of agent  is an answer. I've made some tests so it can be done. There are plenty of security and UX issues to solve.  Stay tuned. 
Sorry, don't know how to help you. The URL  that you have provided points to your local machine.
Good idea. We will add validation for all object names. Stay tuned.
You'll need to create a junction table (Junction Table). Vertabelo supports physical modeling only.