Both LBEAR and STBEAR are created for OS's other than z/OS. Could z/OS use them constructively? Possibly. If by "constructive" we positively balance functional benefit over performance cost.
Could an application use STBEAR constructively? Possibly. Probably more likely to be of constructive use if the OS itself uses LBEAR and STBEAR. Peter Relson z/OS Core Technology Design
