I'm afraid that, with such configuration, you have to replace farming service with a batch script that copies the application in the deploy folder and preserves ownership
f.e. cp -p <path/filename> <path/filename>
Hope it helps
If I'm understand right you do not copy from farm => deploy !?
But if the EAR is transported from one JBoss to another this is not via copy. And the file will be created as the JVM process user.
AFAIK there is no configuration to change the behaviour.
But why do you run JBoss not as USER1?