This isn't something we'd do often, but it would be nice to do. If we have a really wide schedule, it would be nice to show the Type Mark on the left as well as the right. This way if you don't get lost on the wide lines of information.
Obviously other formatting of schedules could help with this, alternating shaded lines, etc. You could achieve this same thing with a formula that allows text within it, but again, this isn't something we are currently able to do.