There is a few small enhancements I would like to make to Attacher.
1. Make Map Reversed and Map Path Parameter readonly when they don't apply (e.g. when mode is deactivated).
2. Make "Extra Placement" group box in attachment editor disabled when object is not attached.
3. Make a special property and property editor for MapMode that would just have a label (instead of a dropdown) for the mode and have a "..." button to open the task dialog. The reasoning for this is that there is only a few modes out of the long list that can be set with the same references, so I don't think it would be a disadvantage to always have to use the task dialog since you have to most of the time anyway.
I would appreciate your feedback.