It would be nice to be able to open multiple text files (such as data reports) so that analysis can be performed on them as a whole. One way this could be done is with an "Append to existing dataset" checkbox added to the file dialog.
A further enhancement would be to let the user load data from the AID, then add data from text files to that data set. I don't think it would be necessary to allow it to work the other way around (i.e. loading data from the AID after text files have already been loaded) if that would create a simpler interface.