Add a windows explorer menu short cut that would :
When right clicking assembly files (*.dll) which are .net dlls
startup linqpad with an empty snippet that has the dll as reference.
Ultimately linqpad would reflect the public members of the dll and list them somwher in the left pane.

For trying out dlls this would be a killer feature!

You could also implement "spying" on configuration manager so that any calls to ConfigurationManager.AppSettings would alert the user and let him enter a value that the snippet would use.