I had the same problem - I wanted to create my comics with a different output profile so the comics were not resized. I found that pocketbook_900 profile did not resize so I wrote a batch job and scheduled it to run every morning on my PC.
Code:
ebook-convert Arcamax.recipe .epub --output-profile pocketbook_900
set filename="Arcamax [%date% %time%]"
ebook-meta Arcamax.epub -t %filename%
calibredb add -d Arcamax.epub
pause
exit
This creates an ebook with the date in the name - Arcamax [Wed 11/28/2012 6:30:39.21]