I don't typically play computer games, so I'm most at home using a gamepad to play. If it weren't for the viable option in XI and XIV I most likely would have never tried them.
However, XIV sorta lacks any sensible scheme and whilst I'm sure this is something that will be improved upon in 2.0, it doesn't hurt to offer a suggestion I suppose.
My largest problem with gamepad only use in this current scheme is that it basically forces you to scroll through everything that's in camera view. The division options between enemy only or player only is too limiting. For instance, I can't target only enemies and also cure myself. There are probably ways around this but I'm finding it to be convoluted and requiring me to cycle too much through extra menus. In order to target correctly sometimes I either have to sit and scroll many times over or drop the controller and dive for the mouse. Is there an easier way in place already? Maybe, but I'm not aware of it and welcome others to enlighten me.
In the meantime, my ideal controller set up would be a scheme such as this:
Pressing left ← or right → on the dpad would cycle through only players with priority on party members first. So that once it cycled through your party list, the next targets will be the next closest pc's in your range of view.
Pressing up ↑ or down ↓ on the dpad would cycle through enemies and npc's only. With priority on the closest enemy incurring the most enmity.
Depressing the dpad itself would focus the cursor on your own character (which it already does).
Thanks for reading through my frustrated rantings