How to create new CF to list RT user?
I need to create special type of ticket assignment for tracking purpose only (not related to ACLs nor Actions at the moment).
You should start from here: Extending/External custom fields - RT 4.4.3 Documentation - Best Practical
Check for CustomFieldValueSources or also check this example: rt-extension-assettracker/ATServers.pm at 3.0-trunk · tbrumm/rt-extension-assettracker · GitHub
Torsten