Leafmotor

Greetings, I have received hub motor kit with everything, and am happy with it so far, although I haven’t assembled everything. I have a couple of questions:
In the owner’s manual after the editable functions of “LIM” (speed limit), “DIM” (tire dimensions), “UNIT” (metric or English units), there are 22 other parameters, named P1, P2, etc., C1, C2, etc, L1, L2, etc. What are those for, and can a user edit/change those, or should I leave those alone? I’m curious if one of them is regenerative braking strength in particular.

Also, I see a controller for lights, horn, and maybe turn signals. Is that for a device that you also sell, that does all of those functions, and is powered by the USB outlet I see behind the display on the side? Or is that just a phone charger, or is it just a plug for any light/horn device? Pics attached below if that helps. Thanks for any info, and for what I’m sure will be another great product!

P1 Motor Characteristic Parameter Setting
P2 Wheel Speed Pulse Signal Setting
P3 Power Assist Control Mode Setting
P4 Handlebar Startup Setting
P5 Power Monitoring Setting

C1 Power-Assist Sensor and Parameter Select Setting
C2 Motor Phase Classification Coding Setting
C3 Power Assist Ratio Gear Initialization Setting
C4 Handlebar Function Setting
C5 Controller Maximum Current Adjustment Setting
C6 Backlight Brightness Adjustment Setting
C7 Cruise Function Setting
C8 Motor Operating Temperature Display Setting
C9 Startup Password Setting
C10 Automatically Restore Factory Setting
C11 Meter Attribute Selection Setting
C12 Controller Minimum Voltage Adjustment Setting
C13 ABS brakes of the controller and parameters of anti-charge control Setting
C14 Power-assist tuning parameters Setting