Or "delete" bind TAB for look showscores, add your image cover and show the score in lua table in your image cover.
And say in server with message every minute or in server info: Bind H for show scores.
Ideas:
Player can change controls in settings ("manually").
Use a menu beyond the TAB scores.
If key TAB is true (actived), addbind and show a menu for "hide" TAB scores.