While I'm sure randomness will be added in future versions of the console (or if it's there I haven't found it yet). In the meantime I build up a plugin that takes your selection and reorders it randomly it so you can use that new selection for your phasers and such.
I need to get around to fixing some things in the Appearance Builder and make it a little easier to download but the files, but for now the xml and lua files are there. and you can just put them on a USB key in \grandMA3\shared\resource\lib_plugins folder.
I'm sure all of this will break next version of the desk but seems works for now.