Well, I LOVE deleted/alternate scenes, so I'm extremely pleased of this post, keep it going.
However it would be much better if all the information were collected in a website, with pictures, script excerpts and videos. Reading the lists, and then all the replies (with corrections and extra info) can be quite confusing. Something like http://www.startrekhistory.com/
(which I also love, even if there are things I don't like). This is not a critic, just wishful thinking.
Important question: where do I find a copy of TWOK workprint? Not the directors cut or the "edited for television" version (which I already have), but the workprint where Spock says that Saavik is half romulan (this one, https://www.youtube.com/watch?v=7rKw66EU5Fc
, from the mysterious apparently unrelated "Captain Kirk Page" http://www.thecaptainkirkpage.com/
Finally, for those who haven't seen it yet, this is the page where I collected all the pictures of the alternate spacewalk scene from TMP, the Memory Wall scene.
It was definitely filmed, but not post produced. I believe the pictures leave no doubt about it.