A feature that allows patches created in this "Legacy Mode" to be "Univ" (Universal) across different platform iterations—like the Nintendo Switch, PlayStation 5, or VR versions—ensuring that a sound designed on an old iPad 64-bit device translates perfectly to modern 3D environments.
While the "bfi2" and "user-hidden" tags suggest custom modifications or unlocking mechanisms within this unofficial release, a "solid feature" inspired by this technical string for the official software could be:
A "Low Overhead" toggle that automatically strips non-essential graphical animations (like ripple effects) and locks background processes to maximize stability on older iPad models, specifically those stuck on legacy OS versions like iOS 11.