Lion-G
Beta Target is best suited only for take-off aerodynamics, where roll surfaces are required to be zeroed.
FCTM
From a performance standpoint, the most effective flying technique, in the event of an engine failure at takeoff, is to fly a constant heading with roll surfaces retracted.
During other phases, the regular convention of zeroing sideslip is preferred.
Full Config is inferred as non takeoff phase, and thus sideslip target is zero.