Well, it has been a while. So busy with my other project, but in testing that out on other phones discovered that Photo Cube still behaves strangely on with regard to the spinning when you swipe left and right.
On the Go Home Launcher and on the Galaxy S2 Touchwiz launcher, things are not quite right when you pan over the far left or far right of the available home screens, it results in the cube still going into a constant spin. On the Desire HD latest update, the cube doesn't do any extra spin at all when you pan left or right.
Turns out this is due to the way different phones interpret the wallpaper offsets and what they end up sending to the Android WallpaperEngine "onOffsetsChanged". In short, I can no longer rely on the scroll position of the current home screen to work out how much extra to spin the cube when panning left and right. HTC latest Sense 3.0 uses a carousel idea which completely ignores that, so you can't pan your wallpaper at all, you are left with a fixed background. That is frankly, stupid, but it is what it is.
So I have changed the extra horizontal spinning of the cube to be completely controlled by the user touch commands. This gives me great control, and has completely done away with occaisonal situations where the cube suddenly freaks out due to odd numbers being sent to "onOffsetsChanged", and has allowed me to control how much it spins and even give it a nice deceleration. I might even turn it into a Setting.
Other upsides, you can now definitely see the "Back" picture a lot more often, this used to be pretty hard to get to appear, because the extra rotation was linked to the home screen. Now it is controlled by the user, so the appearance of the pictures are a lot more random.
Will just do a bit more testing on my friend's S2 to make sure all is well there, then will be off to the Market!