I've had problems finding the correct homepage to some user scripts with similar names. It will be better to have an option to go there directly.
1) a button with options (edit, about, uninstall, etc...) at the right of every script in the drop-down tool-bar button
2) a context-menu option in script manager (add-ons) page
If the script doesn't have a home url, the extension can keep the url from wich the userjs was installed ñ_ñ