Thanks for the positive comments!
In fact, I'm rendering many different images with different camera settings and positions, sun positions etc. It's just mind blowing how fast it is. My initial intention was to render panoramic HDR environments for airplane renderings, but it looks like TG is perfectly able to deliver awesome backgrounds as well.
As for the wide-screen format, that's actually a very good idea, I agree. Would be nice though to have some kind of a panoramic/spherical camera built in (I know this is on the wish list of many users already) to avoid wide fov stretching, the camera already has a focal width of 24mm so it might look distorted in the end. Then again, rotating the camera and rendering separate images and stitching them is doable, it would just save some extra steps.