Sleep timer on remote controls?

This is mostly for DTAs but could, I suppose, also apply to X1. 

It would be nice if the remote, in addition to the general features, had a button for 'sleep timer' that would work for those TVs that had it on their remote control.  Some don't - on some you have to go to the TV's menu - but many do, and it would allow me to put the TV's remote away somewhere if I had 'sleep timer' on the Comcast remote.