I have been playing SuperTux version 1.3 for a long time, and I suddenly got an idea to Google search for any updates - and here it is, a lot of impressive work! I especially appreciate the ability to scroll in all directions, that function itself gives so much more level designing possibilities. Love that!
I have found a newer function where the hostile objects gets killed whenever they get stuck into each other. This change makes it impossible to stack multiple hostiles in the same point, like making a tougher hostile object. I used to do this often in the older version of the game, and I find it sad to lose such an awesome thing. And if you didn't place your hostiles in the exact same point - they would levitate up instead, creating a hostile object rainstorm... which I also found really fun to do, it makes this simple game much more challening! I just don't get the point... if you design your own level, you place the objects in the way you want, you can even use the grid. Why would you ever want your designed, intented hostile objects to die at the same moment as they spawn?
There is also another mechanical function... when hostiles stand on each others' head, and gets of, they will step down in an immediate motion, like teleporting or the way games usally handle stairsteps. This will get the hostiles to get stuck in each other and sadly die even more... I don't get this point neither... because, it looks bad without the falling physics that even existed in the 1.3 version.
I suggest a level property setting for the "kill-stuck-hostiles" function, and if possible - a setting for the wierd "stair-stepping" of hostiles stepping on each other.