During review Thomas came up with a better way of separating name/value pairs in .cfg files. Instead of adding delimiters to string do it as:
jvmuserarg.1.name=
jvmuserarg.2.value=
This is purely implementation, doesn't affect usage

Additional fixes required.
Windows:
 - create user preferences
 - change app.id should be app.preferences.id (pass to app for base preferences key)
 - change JVMOptions to JVMUserOptions
 - unable to modify user preferences
 - macro expansion to user args

Linux
 - create user preferences
 - change JVMOptions to JVMUserOptions
 - macro expansion to user args

Mac
 - macro expansion to user args