you could, but you´ll have to disable quickstart in csm, load the mod, open team editor, edit and apply changes, then click start in gpxpatch, etc, everytime you want to use that mod... so it will be much more easier to edit the file armscolors.ini, the file looks like this:
; ============================================================================
; GP4 Tweaker
; Arms colors configurations
; ============================================================================
[ARMS_COLORS]
CAR01 = @schumacherM
CAR02 = @barrichello
CAR03 = @button
CAR04 = @sato
CAR05 = @alonso
CAR06 = @fisichella
.................
; aliases -------------------------------------------------------------------
schumacherM = #ee2924
barrichello = #ee2924
button = #e6e7e2
sato = #e6e7e2
alonso = #428ed6
fisichella = #428ed6
.....................
; ----------------------------------------------------------------------------
; end of config
; ----------------------------------------------------------------------------colors are in HEX code,
here you can find the code of the colors, just replace it in the driver you want to change and it´s done