As comment at http://www.jabaco.org/board/463-new-version/thread1.html the undocumented Commandline Options for Jabaco 1.5.2:
Jabaco.exe [-projectpath | -d | -log | -jabacoframework | -javaframework]
-projectpath : The name of the main project file. It can be either a .jba or .jsrc file -d : The directory where the binary .class files will be created -log : The directory where the logfile "build.log" will be created. If it is not set, then the logfile will be in the directory which was set with the "-d" option -jabacoframework : Jar-Archive of the Jabaco Framework. If it is not set, it is Jabaco.jar in the Jabaco-directory. -javaframework : Jar-Archive of the Java Framework. If it is not set, it is the default rt.jar in the Java-directory.
To run not the IDE, it is needed that "-projectpath" and "-d" are set. The other options can also be used for the IDE. If you want to use an other Jabaco Framework file you can set it with "-jabacoframework" and the IDE will use it.