Changing amphibious vehicle water speed

[Melody_Mike 127]

Hiya everyone

I have an absolute beginner question regarding vehicle configurations.

My aim: I want to increase the amphibious/water speed of the AMV-7 Marshall unit (classname: B_APC_Wheeled_01_cannon_F ).

After reading it through the config viewer, I think I only need to adjust the " waterspeedcoef " value. 

But how do I do this?

TL;DR - anyone have a FAQ/Youtube link/BI forum post on how to change parameters on an existing vehicle?

 

(Pardon my ignorance. Googling just gave me tutorials on how to create an entirely new vehicle)

[Melody_Mike 127]

After some googling, it's clear that I need to apply this method somehow:
 

But surely replacing the vehicle config file with an edited one is possible with only a script? Therefore no addon (and dependency)? 

Thanks for reading.