modify import list of other scopes dynamically?

Is there a way in MATLAB to modify the import list of a scope different from the current one? That is, I would like to be able to do something like this:

    function import_mypackage()
        evalin('caller', 'import mypackage.*');
    end

This doesn't work. No error is produced when calling import_mypackage(), but the namespace contained in mypackage is not imported, i.e:

    function foo()
        import_mypackage;
        g(); % Wanted mypackage.g() but got: Undefined function or variable
    end

I know that you can modify dynamically the import list of the current scope either using eval or by passing a variable to import(). However, I cannot find any way to modify the import list of other scopes. Is there any way?

NOTE: I know there are many good reasons for not doing what I am asking here, but I think I have one reason to actually need this (I can give more info if someone asks). In any case, I would like to know just out of curiosity whether this is possible.

Thanks in advance!

[German Gomez-Herrero]

It seems evalin() has some pretty weird behavior, especially when combined with import(). See:

http://stackoverflow.com/questions/13231480/matlab-modify-import-list-of-other-scopes-dynamically