I get used to ctrl+click code assist which would find the declaration of a variable/class/method in Eclipse, Visual Studio, Borland\Embarcadero Delphi. It is an extremely useful feature when dealing with a large code base.
I have following options enabled

as it should be for this Code Assist working in Eclipse, but this doesn't affect Apex Classes?
Am I missing anything or this feature is generally unavailable in Force.com IDE?..