If you are regularly changing a service's configuration you might want to wrap the entire stop, remove, reinstall, start procedure in a batch file. For example:
@echo off "%FIREDAEMON%" --stop myservice "%FIREDAEMON%" --uninstall myservice "%FIREDAEMON%" --install myservice.xml "%FIREDAEMON%" --start myservice
More information on various FireDaemon command line parameters can be found in the manual.