The number one thing I wish I could see in scheduling software is the ability to view the script from with in the software, and be able to upload new version as they become available. Through FDX or PDF, I'd love to be able to match scenes to strips.
The amount of time saved over the course of scheduling would be astronomical, the seconds added up over time would just be so huge.
A bonus be being able to tag out the script from that pane, and see the tags in the breakdown.