No, they are the same. There are two because I could never remember if it was called one or the other, so now they just alias to the same functionality.
Good question. Could be that there is a discrepancy between the display and actual filter engine. Can you give an example?
Yes, the filter GUI works for simple cases, but we should also have some more advanced stuff. As always, time is the problem, so if you can code something, please do 