This idea seems pretty much dead. What a shame.

A speech engie would be very attractive. One function is commands, another is text input. Speech recognition software exist for GNU. Could this not be used as a basis for scripting a system that would react to basic commands and take appropriate actions as a result. For example 'music next song' or 'music stop' a script to make it first look into the different options under music and automatically recognise this is relevant to music player, and then secondly perform the action 'stop' or 'next song'. Then another thing could be for example 'PDF read page 19' or 'browser read *find on page*speech to text* I'm beginning' *start*. Or 'speech to text *where marker is*start*'. Another few options 'open browser'. listens to open command first, then action. Or 'call contact John', or 'call number 12345678'.
As you can see, I am no programmer, I can imagine it would be quite a work to script a speech recognition tool and speech to text tool, but in the end it would bring much joy and many advantages.

Organising it in a tree structure like described would make the first job a bit easier, and would open easier programming for the people who would program specific actions and syntaxes to fit the main commands.

Just my opinion.