Seems there's an issue with Lumos and the G-sensor on the HD2. When Lumos is running, it makes any app that uses the G-sensor hang for a moment everytime it reads the light sensor. On an app like Caver (ageye.de), it locks about 500ms at every sensor read, making the game unplayable. It's less noticeable in the built-in Teeter game, but still visible.
I'm on the official 1.66 ROM, but others have reported it too.
Would it be possible to disable auto backlight control by Lumos, but just keep the exceptions?
I'm OK with the built-in auto backlight control, but would just want the backlight to be forced to full in selected applications (photo and video viewer). Could Lumos have a mode that only monitors the active window, if an exception is found it forces backight to the set level like now, and otherwise just activates the device's default auto backlight function? That would be a workaround until a sensor read fix is found.