First off, nice program! I can see this being very useful.  My problem is when I create a custom property, I am unable to go back to the "Create New Property Type" dialog and edit the property by either adding or removing values from my custom property. I am only allowed to rename values that have already been added to the custom property. This forces me to obliterate my custom property and make a new one if I want to make more or less values to an existing property.