Using a Sanwa MX-V only seems to offer a HI/LOW aux channel. This will suffice for headlights and the brake and reverse lights can be automated with an Arduino. Control of the directional signal lights and independent control of spotlights will need more channels via the Arduino.
The Sanwa manual includes a brief notes on setting up CH3 high/lo end points;
http://www.racing-cars.com/images/pdf/MX-V_manual.pdf
A search for 'Arduino RC light controller reveals Open source light project. The schematics and code look pretty comprehensive.
https://www.rcgroups.com/forums/showthread.php?1539753-Open-Source-Lights-Arduino-based-RC-Light-Controller
There are other guides for decoding RC receivers with an Arduino.
https://www.sparkfun.com/tutorials/348
https://ryanboland.com/blog/reading-rc-receiver-values/
Rather than trying to squeeze more functionality out of the existing channels in an array of street fighter style control sequences why not use an another transmitter. I was looking at using low power RF tranmitter modules but then I noticed the winch controller remotes. Looks like a key fob style IR remote to me.
There are a plenty of tutorials for turning on/off LEDs with a universal remote.
https://www.google.co.uk/search?client=firefox-b-ab&dcr=0&ei=MnB5Wp3iLKGVgAaCia74Bg&q=arduino+infrared+remote+LED&oq=arduino+infrared+remote+LED
Hit #1 looks as good as any other... and simpler than the low powered RF tutorials I have looked at.
http://www.electroschematics.com/9522/arduino-control-leds-ir-remote/
On to the prototype....
Arduino Nano clone £3.28
Infrared Remote Control Module Transmitter Receiver Kit £2.40
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