While this tool has many great features, I find I am very limited as to using it. What would help tremendously is to be able to merge based on the attributes name, or be able to re-number the attributes. A good example is I want to update all my plan files that I reuse. With the new composite skins and line definitions I am able to tweak the composites. However, more often than not I can't overwrite because I'll end up with a footing for a ridge vent, or something else not considered very professional by many. (also fix it so it want crash so often).