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Select structure mode for selecting whole structure with one click is needed
If in select mode, select all can be done by double click on atom, or it can be done via the menu. What way would you suggest to do it with a single click? Can't see a possibility for this right now.
Single click on atom/bond or in the inner space of structure (in latter case some visual hint about what is to be selected will be appreciated). Just like in MArvin or ChemWindow