WHMCS has an option to make the URLs Friendly, but this option doesn't work for all WHMCS sections only supports the downloads, announcements and knowledgebase sections on
the client area - it is not currently possible to use them elsewhere on
the client area. the rest of the pages is using .php at the end of the URLs. this is really bad for SEO.
It would be very nice if supporting the client and order processes too.