Webform api - using the included hooks to change email destination?
Was not sure wether to delete original question or not, but decided on leaving it here since it is listed by google when searching for webform api help.

Turns out the code above does execute the hook. I went for lunch, came back, retried and suddenly the hook is invoked as expected. 

To anyone needing to change form values or email info on submission of a webform, this hook is the real deal.

Cheers!