Could something like you have e.g. in Eclipse please be added?
E.g. upon pressing CTRL+SPACE I would like to see a dropdown menu popup on my cursors position containing a list of appropriate subelements (like it is currently listed in the "Insert Element" box) additionally filtered to elements starting with the text I already started to enter directly to the left of my cursor (if any).
E.g. if "foo1", "foo2" and "bar" were appropriate subelements, so hitting CTRL+SPACE after entering "foo" should show "foo1" and "foo2" in a dropdown list and hitting CTRL+SPACE without entering anything should list all 3.