The RST F1RST Air 29 shock has a lockout knob on the top right of the fork stanchion it's nifty. But I didn't like how it was indexed and don't have a very good feel. It also seemed to limit the lockout adjustability . This is my hack.
This modification may void your fork warranty if you have one. Don't attempt to do this unless you're okay with that. Yup
Step 1: Undo the Mini Alan Screw.
I did this mod before a night ride hence the darkness and absence of my normal bike tools.