Sometimes you have a list of people. Each person object has a Picture attribute which you may like to display in the list. When you export the list to CSV, the picture attribute is exported as binary which is useless. I recommend two options for support to consider:
Good - ignore Picture attribute types when exporting (I don't know if Sencha controls that or what).
Best - provide an option in the "More Options" of the list item to enable/disable export. This allows the developer to list the key attributes needed in the view (and the expanded view) yet deliver many more attributes when exporting. I know that choosing expandable achieves nearly the same thing, put again I have this picture export issue... I would like to display the picture but doing so makes a mess when exporting.