Way the Append Complex Data keeps adding (duplicate) the pictures every time I do the import. Can this been change? All other data (attributes) are not duplicated, just the images.
I'm not able to comment yet so i have to do it this way. I'm kindly asking you to add more information to your question. Based on your description and the tags you are trying to import some data through CSV and your images become duplicate? Do you use a dataflow profile? I don't have enough information to determine your exact problem.
I myself find magento's CSV import sometimes a pain in the em.. butt. Therefore i always use Magmi to import my CSV files. It's faster and has a lot of features which makes importing data easier. The following link goes to the Magmi Wiki of Image attributes processor. Maybe Magmi can be your solution. Goodluck.