Thanks for helping very much!

This is a nice mod, but it's better to use the mod API command for this so that it will behave correctly when the mod is disabled. By the commented out line, I see you tried that.

In your modinit, try changing
local function load( modApi, options )
to
local function load( mod_api, options )


If the variable name you use is the same one passed to the function, it should work now.