Embedded commands in voice input

Not full natural-language, but fixed phrases
Better than underlying VR system, because:
- no artificial pauses (which are slow and increase stress)
- tolerant -- just repeat a mistaken word
- potential for adaptive mode -- reduces frustration
Could be interfaced to flexible command navigation
- good for jumping to dimensions e.g. for pedal navigation
- navigate command-phrase word tree?
Does not interfere with other commands, including normal VR commands