You should just create your own big image for putting your cameos in and then add references to your image file in the correct INI file (don't remember the name, just search occurences of currents big TGA images in all the INI files).
You must specify the filename and the coordinates of your cameo in.
Be careful of the image size. THe sizes must be 128,256, 515 or 1024. (less would be too small, more isn't always supported by graphic cards)
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