1) Assassination success factors.

2) How evade ever improves.

3) Factors on various saves, especially paralysis. How exactly does int/wis/level/race/saves factor in, number wise to a successful save.

Though I'd be really curious about all the details on hitroll and defense success factors (size/weight/strength/dex/skill percentages/legacies/WEAPONS/etc/etc) I'd probably stear clear of it if I only had an hour because I've seen other code for this kind of stuff and it's never an intuitive read ... by a long shot. And I read a lot of code.

4) Oh as a bonus I'd look at if/what elf resist charm all does.