A comments column on the main job list would be useful to annotate failed
builds. It happens often several developers troubleshoot the same issue at the
same time. This column would be used as basic communication on the team to
1- know why the build is broken
2- know if someone is already working on fixing it

Plain text that can be edited in place would suffice... An editable label would
be nice, for an example try double-clicking on the first paragraph under the
"Editable Content" header here:

http://tool-man.org/examples/edit-in-place.html