Funny solution - but I think it is easier to take more a look at your command phrase structure.
So it depends on how you build your command phrase - for example: If you want to turn ON or OFF the kitchen light, you can build a command phrases like "turn the kitchen light"-"ON,OFF".
A even better way is to give your command phrases a structureand using also "optional" phrases (if a phrase in your command tree is marked, you can click on the question mark icon to toggle the phrase to optional)
http://voxcommando.com/mediawiki/index.php?title=Command_Tree_Editor#Phraseshere a example:
phrase1 optional: "please, save energy and"
phrase1: "turn, switch"
phrase2 optional: "the"
phrase3: "kitchen, office, bedroom, living room, bathroom" <- payload list or payload from XML
phrase4: "light, lights, lamp, lamps"
phrase5: "on, off" <- payload list
phrase6 optional: "please, but quickly"
You need to speak only the red phrases to execute the command and the blue phrases are optional which can be used too, but not needed to execute the command - this is only a simple example
With phrase3 as payload, the command can be used to switch ON/OFF lights in different rooms.