You can add the plug in to the plug-ins section of the s_code in DTM, and then set up the code required to build out the string of campaign values right in the do plug-ins section of the s_code.

I have reported this issue as a bug within DTM last year in October. At that time, there was an issue with stage vs. production. In stage, the variables from the custom code did not appear in the tags.The settings in the template would be included in the tag, but nothing from the custom code would b...