that can't be done from a batch file.
once Ootake is running, the batch file is no longer running, thus would be unable to press the letter C. You'll need some other app to run in the background to press the C key.
You could try doing this, but I doubt it will work:
ootake.exe < letterc.txt
then make a tiny text file called "letterc.txt" which just contains the letter C and a carriage return/line feed. that will jam a C into the program, but it would do it immediately upon loading ootake.
otherwise, this came up on a search for ootake command line options:
http://forum.arcadecontrols.com/index.php?topic=89009.0good luck!