This is related to
MDL-12042. Maybe it is not a bug but certainly is something that can be improved (for usability), for the new moodle 1.9 gradebook. It would be great to add a "delete" (X) button to each gradable item. This would be really helpful for instructors to decide what assignment/quiz/forum need to be included into the gradebook and what should NOT be included. Another example is that, once you changed the "Aggregate type" of "News forum" from default "No ratings" to "Sum of ratings" (with grade = 100), then you have just added the "News forum" as a "gradable" item in gradebook. However, after you add it, you can NOT delete it from the gradebook, even i f you go back to the "News forum" setting and change the "Aggregate type" back to "No ratings", it will still be listed in the gradebook (see screenshot). Although you could "hide" the "News forum" in the gradebook, but it just gray-it-out. This could become a bit problem if a instructor has a lot of forums initially created with "Aggregate type" to be "sum of ratings" but later change their minds and change this back to "No ratings"