Yep, that's on our todo list already
Not to worry.
We're working on some big things right now (Android app, site redesign, support improvements), but once that's all out of the way we're going to add a more flexible searching / profile system. Also you will be able to put down raid times on your profile, so you only see raids you could actually attend etc. For me, for example, there would be no point in showing afternoon raids on say a Wednesday.
Founder/Developer of OpenRaid
Got any questions, additions, requests, complaints? Let us know!
The quickest way to get help is by making a support ticket (rather than PM'ing).