You could try using wildcards, which does potentially allow the recognition of multiple commands in a single phrase
Though, you may find recognition accuracy to be substantially less than with predefined commands, as it relies on the speech recognition engine freely recognizing not just words, but single letters, without any context.
Speech recognition in general works best with complete phrases, which provide a fair amount of data for the system to work with. Single words, let alone letters, are not an ideal scenario, by any means.