LRB Exhibition has been updated to version 1.44. Being a sub dot release, it’s still a new feature, and that feature is keyboard navigation. To see in the Web Module, you need to click into the centre window to make it active before the keys will take effect. Left and Right arrow control Previous and Next Photo, while Spacebar will toggle Play/Pause.
A demo version is available from Photographers Toolbox, where a serial can be purchased to make it into a full version.