The Omni Trigger was not working since the latest VAM updates.
In order to make it work, I had to remove the Vive Controller related options.
I am not sure to add them back in a further update, since they were not the main point of that plugin. It was for sure the culprit for the latest incompatibility.
Let me now if you want these features back. If enough people want them, I could try that again.
Anyway, find the working version attached to this post :)