The introductory texts of block-related special pages ([[MediaWiki:Blocklogtext]], [[MediaWiki:Ipblocklist-summary]], [[MediaWiki:Globalblocking-logpagetext]], [[MediaWiki:Globalblocking-list-intro]]) are typically used to refer to each other and external tools like the crosswiki blocklist, so that administrators can look up more information. It would save a lot of typing, if the messages had access to the username parameter when the list is filtered to a single user, so that the links can too include such filtering.
Note that some of these special pages expect the user name in the URL parameter to be in the form "User:Foo", while others use simply "Foo". The parameter passed to the interface message should be just "Foo" in both cases.