How can I have multiple descriptor files for a single AIR task in FDT 5.5?

In FDT 5.5, the launch configuration for Desktop AIR applications was removed, and with it the ability to simultaneously deploy and test one target (for example, Desktop) using different description.xmls.

Now I need to change it manually on the "Construction" tab in the project properties every time I need a different description. xml for one purpose.

I also want to use the FDT GUI and not use ANT.