I have never done this before so it may not be optimal, but the only way I enjoy ESO or any action RPG is with a controller. For Mac there is only one option to use a controller and that is Joystick Mapper. I couldn`t find any custom settings for ESO so ended up working my way through it and made these settings.
They work great for me and if there is anyone else out there that would find it useful, go ahead. Any command you need in combat or general exploration is covered, though when it comes to selling/buying/guild stuff etc..etc... I use the keyboard.
To get this to work properly you need to change the controller settings in ESO as follows:
-Weapon Swap - B
-Dodge - U
-Synergy - X