Il like a lot the transparency Ambient feature, but I feel it is strange to have one opaque window and all others on the back transparent. All those transparent windows make for me a visual confusion. I was wondering if it's possible to parameter it differently. I would like to have a transparent window only for the window moving during the move. Then releasing it, the windows become opaque again.
You can adjust that feature in system prefs in the DisplayEngine Effects Tab. It won't work for moving a window, though. It is only meant for a solid active vs. non opaque inactive windows.
I got it on my MacOS 9 installation. It calls Power Windows and combined with Platinum Sounds it's really cool feature. Unfortunately not available on MorphOS AFAIK.