With the change in the deployment structure for the 1.4.2 plugin, there is no longer any way to specify different runtime parameters for different JRE versions. For example, if you have both 1.4.2 and 1.4.2_03 installed on a Windows system, and you change the Java runtime parameters for 1.4.2 using C:\Program Files\Java\j2re1.4.2\bin\jpicpl32.exe, this will also change the runtime parameters for 1.4.2_03.
Version-specific properties are no longer written to individual properties files like they were prior to 1.4.2 (i.e. C;\Documents and Settings\Administrator\.java\properties141). Instead, they are being written to the C:\Documents and Settings\Administrator\Application Data\Sun\Java\Deployment\deployment.properties files. While the deployment.properties file contains version-specific information for 1.5.0+ (i.e. deployment.javapi.jre.1.5.0.args=-verbose), it only contains one generic entry for all 1.4.2 versions (i.e. deployment.javapi.jre.args=-verbose).