Today I learned that you can actually lose code in Pharo because the record is not always added to the changes file.
Also using the tool is quite a lot of pain, so if you want to recover your changes you have to do a lot of archaeology.
I've added several issues and marked most of them as '2 - Really Important', because I think they are (especially for students etc that like to break things), but maybe you don't want it for Pharo 5.
Peter