Thanks for posting this - I've had the same challenges. It would be great if you could import the same symbology to multiple rasters at once, but I guess that's a question for the ArcGIS forums...
I also wonder whether future versions of SLAMM would let you specify the format of the output name. I am also trying to batch rename my files because the names are far too long and complicated to do subsequent batch processing in Arc (most of which requires converting the ASCII to raster first). You get a slurry of errors due to spaces in the names and the length of the names. I'm currently looking for python scripts to batch rename my files.
Just as an example, I'd like to rename a file of this format:
Run3-37_output, 2080, 1.664 meters _GIS.ASC
To something like this:
R3372080n.ASC (where n stands for not protected)