Not sure if this is the PC ( or politically correct ) way to do it, but, when I just want something not to run, during startup / shutdown, or in your case, disable it, I use Sys-V and locate the service in the Run Levels, and remove them - both from the START and the STOP service listings...

I had to do this to get Arts from starting on boot, so that ALSA would be the only sound service running...

Hope this helps,
Ms. Cuddles