Windows 7 64-bit, GTX 770 OC
Blender 2.79RC 6af7d7e
Timeline >> [View >> Only Keyframes from Selected Channels]
When entering tweak mode for NLA tracks, Blender automatically disables the above option. It will re-enable it, if you enabled it before or during tweak, but it will never enter Tweak Mode with it checked.
I don't see any way to disable this "auto-disable" thing and it's really annoying to have to re-enable it every time I start tweaking (to go to keyframes for only the selected bones)