I finally managed to work a little further on eSteak where some nice features found their way in. At first, I added the possibility to handle more than one MooTools version (I also uploaded the latest version 1.2) and, theoretically, even other modular JS frameworks. Then I added new compression methods for the download file, namely YUI and JSMin.
If you now upload a new plugin, you have to choose your framework version first. If you then want to add some dependencies the autocomplete only shows the right ones for the chosen framework, of course. Smart, isn't it?! Additionally, the site , automatically prevents a download basket with different versions in it!
To prevent confusion, I renamed the "old" core plugins and added a "_1-11" to their names. I hope these litte changes make the site even more attractive to everyone. 
