Yes, the manual is nerdy and sort of deliberately so. There are zillions of HDR software out there and we don't intend to rule the world with this one, Lightroom's built-in tonemapper is so good for the casual user that it has killed most of the casual user HDR market anyway.
Instead this is for the "nerdy" user like myself which wants to be in control and see what's happening (and like tonemapping to work the way we like). Our original plan was to have this nerdy reference manual, but add some lighter videos to show example workflows. We don't have any GUI screenshots in the manual as the manual was written at the time when the GUI was not finished. So we know about some of the issues. We're a small company though and we got choked with other work so we've unfortunately not been able to progress on that, hopefully we will soon. Meanwhile we put the time we have into actual software development, releasing a maintenance release soon with some updated raw support. So although we certainly appreciate feedback we may not be possible to react to it as quick as we'd like.