I thought you had solved that with:
However, I do believe if the class definition exists Ext.Loader won't kick in. This is most likely because using the Ext.Loader in a production application is not advised by the Ext designers. Could you give my an example on what you mean by
- set Ext.Loader.isFileLoaded.[viewclassname] to false
"I want to have the possibility to let users here modify class definition"
It seems like if this is just user configurable options for each class, then another approach may be better, but I don't quite understand your use case.