In the Revit.ini file, settings in the [TagOnPlacement] section determine whether tags are created by default whenever you place elements in the model.
By default, the TagOnPlacement section does not exist in the Revit.ini file. When you turn on or turn off the Tag on Placement tool for an element category in the user interface, its corresponding setting is added to the Revit.ini file. For example, for cable tray, the Tag on Placement tool is turned off by default. If you turn on that tool on the ribbon, the following is added to Revit.ini so the change persists from one session to the next.
[TagOnPlacement] CableTray=1
If you later turn off the Tag on Placement tool for cable tray in the user interface, the setting is updated in the Revit.ini file.
If desired, you can specify the following settings in the TagOnPlacement section of Revit.ini to change their defaults:
Type = integer
Valid values: 0 = Off, 1 = On
Default value: For Rooms, Areas, and MEPSpaces, the default is 1 (on). For all others, the default is 0 (off).
[TagOnPlacement] Rooms=0 Areas=0 Conduit=1 TelephoneDevices=1