Is there a way to view controller support from my Library?
Yes there is, but it needs to be done within Steam Big Picture mode. Start Big Picture mode and then navigate through the menus as follows;
- Select 'Library'
- Select 'View all Games'
- From the drop down menu select 'Controller Supported'
This will list all games you have licenses for on your Steam account, and you can download them from this screen also.
Lorenzo's tool will allow you to filter your entire Steam library by tag, including full or partial controller support. Your Steam profile/library must be public for the tool to successfully scan your games.
http://www.lorenzostanco.com/lab/steam/
There is currently a way to filter on Controller Support in Library mode by using the Advanced Filtering dialog: