Unity 5 - How do I achieve gamepad support for the UI system?

I'm trying to get my menus working with more than just a mouse. I'm using a wired XBox 360 controller, and the UI doesn't come with built in gamepad support.

I tried making it so that, when a player switches to a menu, that menu has a pre-selected button that they can start off on. If I do this, the player can navigate the menus using the gamepad. However, there are a few issues with this:

• if the player isn't using a gamepad, then it looks ugly to have a button pre-selected

• When the player uses the control stick to navigate, the time in between being able to navigate to another menu is too inconsistent. Sometimes it takes a longer time, others it's almost instant.

I want to know if there's a relatively easy to add good amepad support to menus. I can make my own script if necessary, but I'd like to know if there's a better way.