The patch is, a bit less proudly, here: http://pastebin.com/TK5cTYFQ
The result of this project would highly benefit the people who focus on the content of a presentation itself...and don't care about animating each slide differently, but still dislike the default "I just appear" effect that's default in Impress.
Making this was a lot of pain, although it doesn't look like it. There are, of course, things that don't perfectly work. They are cleverly hidden in the demo :) However, the exact points of fixing and improving have been pointed out in the code, but the time was running short.
I have spent the last three months with a 'I will first code, then blog" attitude, so I will now rewrite my experiences, and pain points, and how it all fits together in the end :)
Hope you have fun reading this, that's all that hacking's about, no?