You don't need Windows Admin, you just need write permission to the directories pointed to by CATReferenceSettingsPath and by CATCollectionStandards. Then fire up CATIA in Admin Mode, and edit away. Talk to your Systems Admin to get theses settings changed.
Bear in mind, however, that these settings are global. For some reason DS has seen fit to provide us with only one arrow size in V5. I find this very strange, as we use arrows of varying sizes for various purposes on the face of our drawings. We have had to resort to creating several Drafting Details that we have placed into our Drafting Catalog.

Yes, you are right. It is very tedious and time consuming.