Getting the right view display block

So after a little configuration work, I realized that my view block display wasn't quite right, so I created a new display block with a different name. Two issues here. The ddblock instance doesn't give you the ability to change the display it is using. Apparently I need to delete the instance I've mostly configured and start from scratch. Also, the dropdown of content to use in the new instance only lists the view name, not the display. Since I just added a display to the same view, and I'm using the other display in a different instance, I now have a dropdown with two identical listings. I'm going to assume that they are in the same order as they are in the settings checkboxes listing (which does list the display), but it would be convenient if the next version could add the display name to the dropdown, even if it isn't feasible to make the content choice editable.