Hi,
I think it'd be useful and efficient a have a button to switch all the modes automatically from 'Discard New Item'/'Read' to 'Add New Item'/'Replace'. This would be very useful in new data models or when loading a new entity/hierarchy as you do not have to manually change the mode for each field area in the data reader. You can easily end up loading 40 entities in one data reader, which would be 80 fields (code and desc) to map manually.
Thanks,
Waleed