I have several games in my library and don't recall which us touch controllers. Same when I look through the store. Are there any symbols that are noticeable to denote which controllers a game use? If not, there should be just be.
If you right click on a game in your library and select Details then in the side box it will say if Touch is required (such as Medium, Dead & Buried, etc). But for things like Please Don't Touch Anything, where Touch is optional, it won't mention Touch at all.
Unfortunately there's currently no way to custom group games like Steam.
you can also select details using Home from inside the headset by selecting the 3 dots to the right then details. The panel on the right that comes up usually indicates what type of controls it needs.