This has been requested at least twice before:
7/2008:
http://forums.omnigroup.com/showthread.php?t=9103 (told it's an existing feature request)
4/2009:
http://forums.omnigroup.com/showthread.php?t=11824 (told it's been added to the existing feature request)
Thanks for adding your voices too. Maybe it'll have an effect. But I'm still waiting for a lot of feature requests and am not getting my hopes up.