It would be very nice to see the Eclipse/AptanaMonkey efforts grow up into some serious productivity feature. I would be very glad to be easily able to script the whole Eclipse application, along with Eclipse styled GUI elements. Preferrably as XML, which describes the UI (XUL alike or so). Currently I am mostly missing an easy to use API. Something along like a Javascript toolkit, but for Eclipse.
proj = new Eclipse.Workspace.Project('project_name');
proj.build('target_name');
proj.delete('resource_name');
ed = new Eclipse.Editor('editor_id');
ed.load('resource_name');
ed.moveCursor('up',15);
etc.