Supporter plugin not active by default

Hi,

I have 2 blog profiles: supporter and none-supporter. I have made 2 templates with the blog templates plugin from WPMUdev. I have also customised default widgets and dashboard based on wether the user is a supporter or not using the function is_supporter().
But I have one last problem: How can I make it so that the supporter plugin is not enabled by default (and so is_supporter() is false)? I would like to manually enable to the supporter plugin for some selected users.

Could I move some of the supporter plugin files from wp-content/mu-plugins to wp-content/plugins, and which ones ?
Or is there another way ?

Thanks

Catherine