As I said earlier (post #55), in TMOST on page 191 it DOES say that "impulse engines" are STL. I believe that portion of the book came straight from the writers guide. In any case it seems clear by that quote that impulse=STL. There is no documentation that indicates anything different.
It wrong because it stupid.
The Romulans have to have some way of going faster than light or they would not get anyway let alone be able to start a d earth/romulan war!