VR-MAX9924 make adaptive vs fixed threshold (runtime) configurable

[dron0gus]

See https://rusefi.com/forum/viewtopic.php?f=4&t=2996
Is it possible to add three inputs to this module:

• One to select between A2 and B modes, goes to ZERO_EN of max9924 (GND - A2 mode, Vcc - B mode). Internally pulled to 5V, so OD GPIO can be used to switch between modes.
• One for BIAS. It is safe to supply external BIAS voltage even in A2 mode when internal source is used. 2.5V should be externally supplied.
• One for threshold (high) voltage. Should be in BIAS .. 5V range.

[rusefillc]

[dron0gus]

This also needs Discrete VR module modifications to make Vref (2.5V) and thres_high available to outside.
OR
Copy-paste some part of VR descrete to make fully self-contained module.