Would like benchmark comparison on Performance Report

As per title, benchmark figures and graph would be really useful on the Comparison Report. Then we could compare to benchmark for any date range.
An alternative would be to provide a facility to select a date range on the Portfolio Overview Page - which does provide comparison to benchmark. However, as far as I can see, the overview only allows pre-defined date ranges (eg. “in this financial year”). The date range that I usually want is not in any of the pre-defined ranges and I would need to select the actual dates like I can do in the Performance Report.