running RC or SP via plugin.ini path

[QuakeMarine1]

hiho
i run 3dsmax with commandline to use plugin.ini X insteat of plugin.ini Y on startup to load different plugins (versions)
so far no problem

I like to do the same for vrayRC or vraySP
but vray place cgauth.dll and limmd.dll into the maxroot
if I move the 2 .dll away I get vray error on startup

who can help
batch copy the version i need is the current solution but for some special reasons i need/prefer the plugin.ini way