Feature Parity for Single-object and Custom Reports
The custom report builder has many powerful tools, such as gauge and combination reports, the ability for "or" logic in filters and report calculations, additional data sources, and much more.
The single-object report tool lacks these features. Bringing some custom report features to the single-object report builder would be extremely helpful (though not all would be possible).
Bringing these tools to single-object reports would allow for quicker queries and the ability to add the reports to the middle columns of records.