[logback-user] Logback configuration

Hi all, Is there a way to specify the file substitution propery as something configurable? So I would not do <configuration> <substitutionProperty file="variables1.properties" /> but <configuration> <substitutionProperty file="*${logback.properties}*" /> where in Java I would have to specify something like java Main -Dlogback.properties=c:/project/Main/main.properties to be able to run my application? Typically I want to have one configuration file, but sometimes I use multiple files to be able to turn on/off certain functionalities. I'm also thinking of moving the logback properties into my application properties file (not sure yet). This configuration option would allow me to achieve this. Thanks, Natan