[Speedgrader] Keyboard shortcut to grade all rubric rows in SpeedGrader

[kevinwortman]

Problem statement:

Grading assignments with a rubric in SpeedGrader requires many clicks, which is slow and can cause repetitive stress injury. Submissions usually get the maximum score in most or all rows, so a lot of this clicking is unnecessarily repetitive.

Proposed solution:

Create a keyboard shortcut to set all rubric rows to maximum score (perhaps p for perfect), and another shortcut to set all rows to minimum score (perhaps z for zero).

User role(s):

instructor,ta