Updated first post with v1.4.
Here's a complete list of current implemented commands:
http://sh4.skwas.net/redist/shspeech_commands.xml
Note: this is the same file that comes with the mod, I've added a stylesheet so that if you open it in a browser, it shows the file formatted as a webpage.
Also read the first post again!!! Several important changes have been made! Any customizations done on 1.3 have to be redone.
Enjoy! (and yes, German will come soon after this)
NOTE: Make sure to exit the game at all times before disabling the mod, otherwise, the game will keep a file lock on the DLL and thus it can't be removed...