+1 for giving an option to not truncate the description.
The problem here is that this description gets truncated on the server side. I strongly argue that this is something that should be handled exclusively by CSS, as doing so would completely cover this issue (and many others).
Also I cannot see why this would need to be truncated in the first place. If the user puts in a lengthy description there, he probably has a rather valid reason to do so.
In my case, it is the description of a MultiJob, and I want to display the branch names of two subprojects, as well as a URL that points to the QA system where the projects got deployed to.
To be honest, this looks like the kind of option mostly resulting in cluttered config pages that people complain about.