Software Deployment

Anyone knows all about Java deployment?

My customer wants to add a runtime parameter to a specific Java version in the Java console.

I've found the information in the deployment.properties in the user-profile.
Now I want to know if there's a possibility to pass this as an argument to the installer, or otherwise sort this without scripting it?

This is how the deployment.properties file looks.


#deployment.properties
#Thu Mar 08 15:55:02 CET 2012
deployment.javaws.cache.update=true
deployment.version=6.0
deployment.capture.mime.types=true
deployment.javapi.cache.update=true
deployment.browser.path=C\:\\Program Files\\Internet Explorer\\IEXPLORE.EXE
#Java Deployment jre's
#Thu Mar 08 15:55:02 CET 2012
deployment.javaws.jre.1.location=http\://java.sun.com/products/autodl/j2se
deployment.javaws.jre.0.args=
deployment.javaws.jre.0.registered=true
deployment.javaws.jre.2.enabled=true
deployment.javaws.jre.1.args=
deployment.javaws.jre.1.enabled=true
deployment.javaws.jre.2.args=
deployment.javaws.jre.2.platform=1.5
deployment.javaws.jre.1.registered=true
deployment.javaws.jre.2.osname=Windows
deployment.javaws.jre.2.osarch=x86
deployment.javaws.jre.0.osarch=x86
deployment.javaws.jre.0.osname=Windows
deployment.javaws.jre.2.location=http\://java.sun.com/products/autodl/j2se
deployment.javaws.jre.1.product=1.6.0_20
deployment.javaws.jre.2.registered=true
deployment.javaws.jre.0.platform=1.6
deployment.javaws.jre.0.path=C\:\\Program Files\\Java\\jre1.6.0_30\\bin\\javaw.exe
deployment.javaws.jre.0.location=http\://java.sun.com/products/autodl/j2se
deployment.javaws.jre.1.path=C\:\\Program Files\\Java\\jre6\\bin\\javaw.exe
deployment.javaws.jre.0.enabled=true
deployment.javaws.jre.2.path=C\:\\Program Files\\Java\\jre1.5.0_12\\bin\\javaw.exe
deployment.javaws.jre.1.osarch=x86
deployment.javaws.jre.1.osname=Windows
deployment.javaws.jre.2.product=1.5.0_12
deployment.javaws.jre.1.platform=1.6
deployment.javaws.jre.0.product=1.6.0_30


Note! There are side-by-side installations of Java on the machines.

The problem with scripting this would be that (if my assumptions are correct), if/when next version of Java is installed the 0, 1, 2 in the text above will change so the latest version is always 0.
So, I would need to first check what number the Java version have (in my case 0 for jre 1.6.0_30)
Then add -Xmx256m to the row "deployment.javaws.jre.0.args="

My question is:
Is there an easy way to do this?
Anyone done it? How?