Hi,
the /usr/bin/jfritz shell script on a Debian installation should accept command line options and pass it to jfritz.jar. This is easily possible by adding a $@ behind jfritz.jar:
java -Xmx512M -jar $JFRITZ_HOME/jfritz.jar $@
This help users to e.g. call jfritz with the -q options to skip the splash screen.
Thanks,
Andi