I tried changing it through by importing cba settings and adding a line there but that didnt work. so what i did was

go into the mod folder
open addons
open klpq_musicRadio.pbo
under functions, open fn_postInit.sqf
search for "backpackradioSP", there should be two results, the one we want is the second instance
under those lines of codes you wanna add the same lines, but just change SP to MP
so it should look like this:

[
"klpq_musicRadio_enableBackpackRadioSP",
"CHECKBOX",
"All Backpacks Can Play Radio (SP Only)",
"KLPQ Music Radio",
false,
nil,
{}
] call CBA_Settings_fnc_init;

[
"klpq_musicRadio_enableBackpackRadioMP",
"CHECKBOX",
"All Backpacks Can Play Radio (MP Only)",
"KLPQ Music Radio",
false,
nil,
{}
] call CBA_Settings_fnc_init;


now you can enable or disable it from the addon settings in game
hope this helped

notes:
-you need a pbo manager to open the pbo file
-dont save changes to the file, that wont work in pbo files, you need to save the modified sqf file elsewhere, delete the original one, and then copy paste the modified file into the same location