Yes, in version 0.47, we have the Filter Editor in the Filter menu. I've just dived into it recently, and find only precious little instruction. So it's a big trial and error effort for me. Not that that's a bad thing -- it is fun learning, or trying to
There is a relatively detailed chapter in the tavmjong bah Guide (see link in my signature). So it's a good start with the very basics, but still I find myself stumbling along. Anyway, what I'm trying to say is that yes, you can do what you want, but no, I can't instruct you exactly how to do it. Sorry, I wish I could be more help.