The current latest version of VDMX5 (0.6.2.7) now has the brilliant (undocumented) capability of using Quartz Composer patches as plugins (in addition to clips, effects and text sources).

What you need to do is:

1. Create a Quartz Composer patch with a published input, and a published output... with JavaScript or Maths nodes inbetween.
2. Plop your QTZ in your VDMX/plugins folder
3. Create an instance of your plugin from the Plugin Manager (at the moment you need to restart VDMX for the plugin to appear I think, I'm sure this will be addressed quite soon).
4. Assign any VDMX data source to the input of your QTZ plugin.
5. Assign the ouput of your QTZ plugin as a data source to and slider.

et voila! beautiful. I've attached my sample files...