Agreed. The trait element itself is
<MoveFriendlyWoodsAsRoad>true</MoveFriendlyWoodsAsRoad>.
I believe it's basically saying, whatever the rules are for road (including when they get discovered), apply it to friendly woods as well. I also think that if we were able to change the tech at trait level, there would have been another line after the one above containing the tech, ready for us to modify.
So...it seems, like Putmalk said, it looks like you'd need to change the tech roads are available at.