I think, almost anyone understand me. I only considered that, instead of each user tries to put each table at optimum place according to their relations with each other; system can put each table at most optimum place considering their relations with each other. This is only related to ergonomy and user friendly view.
Technically it can be done but it doesn't make sense. Placing objects on the diagram is a part of the designing process. It's the same process like picking a proper name for table, column etc. I don't think we'll be able to define the "optimum place" for all possible designs and for all users. It's very subjective.
Idéer
Hmm, I'm trying to image what are you trying to do but couldn't. Could you write more about it? Do you missing a feature from the other design tool?
This is not an issue. Vertabelo generates DDL for tables without defined references. References are added later by "ALTER TABLE" commands.