Often I invoke the completion list to view all available methods (on an object) and am looking for a particular return type. It would be great if I could somehow filter down the list by return type. Currently I can only begin typing (more letters) and filter by method name.
I don't exactly how it should be invoked, but I consider this a highly useful feature. It's similar to the smart completion where you only get suggestions that match the expected type of the current expression. But with my suggestion you have more controll and it works even if there is no expected type.