VRKeys
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Speech-to-text button
Cloud-based options:
- https://cloud.google.com/speech/
- https://wit.ai/
- https://www.ibm.com/watson/developercloud/doc/speech-to-text/index.html
Found a wit.ai library for Unity: https://github.com/tanejamohit/witUnity
Also this from Unity Labs: https://www.assetstore.unity3d.com/en/#!/content/69399
You would just have to ensure that any modification like this is completely optional - we run most of our VR applications in locations with no internet access (for security reasons).
Given the existing framework, it wouldn't be all that difficult to create your own special key and hook it up to your choice of speech-recognition service. You'd just need to create a custom class based on Key, wouldn't you?