maybe too late to help, but quickbooks have added a feature that addresses this is

although it is in a far from obvious place...

Under Reports,  

. click the ‘standard’ tab,

. scroll down to ‘for the accountant’,  

. click ‘GL summary (beta)’,

. select the dates you want as the report period, and other options

. run the report,

. click on any amount, subtotal or total in any column to drill down to the transactions comprising the amount

VOILA! You are presented with a report showing the transactions including the split descriptions