Maintenance for the week of October 5:
• [COMPLETE] ESO Store and Account System for maintenance – October 8, 8:00AM EDT (12:00 UTC) – 12:00PM EDT (16:00 UTC)
With some tweaking and practice it works perfectly. The exception being menus, which are best navigated with a mouse (can use controller but it's awkward).
You have to use a 3rd party application. I use XPadder. There are other options. Various guides and profiles for ESO via controller are available on the web, and this forum, if you search.