As i told in another thread, upon my personal opinion this is a near-to-be-perfect corresp. chess server, really a great site!
So far I discovered only 2 things I am really missing:
beside the lack of an ignore function I really miss to set a min. rating for people who can take my open invite - the filter at "My challenge settings" seems to work only for incoming challenges. This is really a hassle, 9 of 10 times my open invite is taken by players either provisional or rated below 1400.