@Staphoent: Not from the UI, but you can tweak the code to basically nerf every update mode used.
Assuming a PW2, the magic is in
here.
Basically set the toplevel self.waveform_ui & self.waveform_full to ffi.C.WAVEFORM_MODE_A2, set the self.waveform_partial from the KindleTouch branch also to ffi.C.WAVEFORM_MODE_A2, and replace the complete PW2 branch by that edited KindleTouch branch (since you don't want the special snowflake reagl behavior anymore).
EDIT: And if you really, really don't want *any* black flash whatsoever (which I don't recommend), also set the toplevel self.update_mode_full to ffi.C.UPDATE_MODE_PARTIAL