  We use a new gyrokinetic threshold model to predict a bifurcation in tokamak
pedestal width-height scalings that depends strongly on plasma shaping and
aspect-ratio. The bifurcation arises from the first and second stability
properties of kinetic-ballooning-modes that yields wide and narrow pedestal
branches, expanding the space of accessible pedestal widths and heights. The
wide branch offers potential for edge-localized-mode-free pedestals with high
core pressure. For negative triangularity, low-aspect-ratio configurations are
predicted to give steeper pedestals than conventional-aspect-ratio. Both wide
and narrow branches have been attained in tokamak experiments.
