Please add options to restart, stop/start (depending on the current server running state) the Selenium Grid Hub server.
Options could be added to "/selenium/" page as links, in similar way as Jenkins plugin "Restart Safely" works.

Reason: Sometimes errors happen on Selenium server (grid hub), or on some of Selenium nodes, which require Selenium server to be restarted.
Now, to restart the Selenium server, the all Jenkins server should be restarted! This is not a good solution, as there could be long jobs running independently from Selenium.

Note: Just "Restart" would be also fine!