Saw your comment, took a look and my guess is this is the Soren code since the docs match what he said about it on pinside. Too bad, I just ordered an NVRAM a day or two ago from pinballrom.com and could have got it burned/saved shipping costs had I known about it earlier.
https://vpuniverse.com/files/file/4884-getaway-high-speed-ii-the-l-5c-competition-mod/
Documentation calls it a patch but the file on vpuniverse looks like its already been patched (it is a .rom file). Who knows.
Personally I wouldn't want to give up the dual mode flippers since I've had them all along but my rom is fairly undocumented so would be nice to get something more mainstream that isn't buggy. So far this sounds like the best option. Worth a try at least.
====================
"Disclaimer
The purpose is subtle changes to correct bugs and make the game better suitable for competition usage. Through balancing random elements, scoring and the relative reward for game objectives.
It is made as a fan based project and shared free of charge.
The patch is supplied as-is without any warranties and support. Use at your own risk.
Please take care when patching the software, creating a physical ROM and installing the ROM in your game. Make sure you do every step of the process correctly. With new software installed, the game may restore factory default settings. Clearing all adjustments, statistics and high scores.
Release note
Changes
The premature multiball (re)start bug - fixed.
With tournament play unselected: Multiball may be removed from Burn rubber awards (with adjustment A.2 13).
Secret mania is scrapped.
Why it rocks
Correct light locks, lock balls, start multiball, jackpot and super jackpots logic.
Secret mania messes up the traffic lights progress and potentially have more hazardous side effects.
Note
With tournament play selected: Multiball is still the fifth Burn rubber award (when no extra balls selected)."