Saving a setting
To save a setting is easy, just make all your settings, choose the "Select A Crop Marks Settings" pop up menu, and select "New Settings", if your are modifying an existing setting the Name dialog will suggest the old name, if you want to overwrite the old one, just let the old name be and press OK, if you want the setting to have a new name, replace the suggested name with a new name and press OK.
Ease of use
Cacidi Cropmarks is very easy to use, create a setting you like as described on top, and press the Apply button in the Cacidi dialog box, or just select the Apply Cropmarks, in the menu Object->Cacidi Cropmarks.
To apply crop marks, just select an object, or multiple objects and crop marks will be applied to the object/objects.