Allow Multiple Dates in Tracked Hours Lists to Display Appropriately in Invoice Date Range

When entering tracked hours that span multiple days in Billable Work & Expense entries, it would be nice if the dates were represented in the date range variable of the invoice field. For example, I entered some hours for 3/17/14 and some for 3/18/14 in the same tracked hours list, but only 3/17/14 showed up in my invoice. I had to use a second Billable Work & Expenses entry to get the invoice to show a date range of 3/17/14 - 3/18/14. I do this to keep the clutter down on same named entries - I like to not have a bunch of the same name listed but instead, combine the hours neatly in one entry. Thanks.