I’ll do some experimenting when I get a chance and get back to you. By-the-way, when you say " make dropboxes either being all active from the beginning" do you mean pre-selected? And can you give me an example (e.g. SKU/URL and the options you’d want selected by default).
Is the problem that people are adding Configurable Products to their basket before actually configuring them? Could you not resolve that by making attributes “Mandatory” - Then they’d see “This is a required field” when they try to checkout without setting anything first.