984x720 support is added in the build I'll be releasing likely tomorrow... it's a bit rough though. The capture details for some monsters run into the "currently in sight" sphere a bit.
Additionally, full screen mode does not seem to function, at least for me. I added a note to that effect if you attempt to trigger full screen mode while running at 984x720. Finally, I moved the tooltip to the left side of the screen and up a little so that I wouldn't have to move the hotkey bars to keep it from covering those.
Still, everything should be on screen for you now.
It's tighter space-wise than I'd like, but even the next resolution up from it is so I knew this one would be too. If I can think of any way to clean up further, I will do so... but that probably won't happen unless/until a major revamp of the front-end as a whole occurs.
Let me know if it triggers for you, and how it works.
To confirm you're getting it, you can check which resolution Demon is running at by pressing F5 during the main game (it won't work during character creation.)