Click on Help & Support at the bottom of the page and contact the staff directly with your suggestion. Yeah I know this is "Site Feedback and Suggestions" but that doesn't mean they read everything here - and they don't.
top correspondence games
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You mean something like this page?
a top games section in the sidebar to the left of the 'my online chess page' would be a nice feature. possibly a checkbox section in the settings to determine what is displayed there, in the spirit of a dashboard or widget set.