Hi Polly. It strikes me that you are trying to visualize the footprints of Issues as if they were Tasks: in short, as a Gantt Chart. Since there's no native way to do so in Workfront, I can suggest two options:
consider converting the Issues in question into Tasks, and (shazam) use the native Gantt Chart views
consider a dangerous but exciting trip to the Dark Side and help me improve our UberGantt solution to support Gantt Charting of Issues : all the delicious time footprint goodness without the convert-to-Task calories!
Awkward analogies aside, the latter has been on our road map for several months, so if you're interested, please drop me a line at doug.denhoed@atappstore.com
Regards,
Doug