This is a great tool within the new Mosaic format. It makes exporting data to oddley shapped boundaries much faster then scripting. However, the limit of 20 rasters is really anoying. It should be unlimited. Additionally the type of output option under settings appears not to work. I have used 2 different import formats (img and generic raster) and even though my setting are set to export an IMG file they always export as tiffs.
