Allow for .XSD to be stored within the modeler so that the file that is used for the XML schema can be retrieved from the application. Without this functionality, each developer has to manage an external location for the files used by Mendix, when this could be managed from within the app.
Another possibility which I use regularly, also for XLS templates etc, is like:
1 - convert your xsd to a string(base64 values)
2 - store this in a (n)pe object or make it is default value for in a string attribute
3 - by need decode base64 back to xsd
I agree, but until then you can create a folder somewhere in your Mendix project where you can store the files?