Here's my little Isometric attempt
http://dl.dropbox.com/u/1289341/IsoDemo.cap
I've got some collisions going but they're not 100%
I stole your movement code
Coincidently, everything else wasn't copied, just happened to be incredibly similar to yours, even down to the tinting
I used your .cap to make jumping:
http://dl.dropbox.com/u/529356/isojumper.cap
It jumps! In isometric! I kinda cheated, it uses Platform behavior, but the platform player sprite is off the screen. The iso player sets it's height to the platform player's height, basically. And I used your collision code to set some blocker objects in the platform area to simulate the ceiling/floor.
A couple of problems:
1. I don't know why but the sorting is no longer working 100%. Maybe because I moved some events around, I don't know.
2. The player teleports down a floor instead of falling when you walk off an edge, this is because the platform behavior wants to "stick" to a moving platform, and the floor blocker is only moving a small 16px at a time, so the platform behavior thinks it's just a really fast moving platform. This could be fixed with a workaround.
3. Sometimes the player suddenly flies off the screen, I think this is because the platform player is somehow getting squished and glitching outside of it's walls. (Edit: Actually, I think I fixed this by making the walls thicker)
Edit:
Oops, either I didn't see the next page of the thread or it got longer while I was working on mine... I'm gonna try Quazi's .cap now...
Edit2: Tooooo Floooooaaaattyyyyyy . I like the 360 degree head movement though, very Excorsist.