Hey there zacfor,
Hope you’re well today and sorry for the late response.
This is not possible out of a box with the current version of the plugin. Using custom post type taxonomies to add sidebars to has been suggested in the WPMU DEV forum. If enough interest is shown for this it will be considered to be added in the future versions of the plugin.
As a custom solution for this I’ve found this, please check it out:
http://premium.wpmudev.org/forums/topic/sidebar-support-for-custom-taxonomy#post-631016
Please let me know if this helps 🙂
Best regards,
Bojan