Smartcockpit
WJP the smartcockpit web site for B737NG-briefings displays the Ryanair RTO procedures which conflicts with yours, which require the Captain to select flaps to 40. Their procedure is to have the F/O do it.
Which is Boeings and how would you know? It is clear operators can make changes to boeings procedures. The procedure I quoted was for the F/O to run flaps to 40 when below 60 knots and stopping assured, I think the focus here is on stopping assured as in decelerating below 20 knots with 5000 feet of runway left , it was the crews call and the operators procedure not mine.