Spacing and Sizing
Properly sizing and spacing type is a tedious task, but Photoshop does
provide some handy—albeit broad—shortcuts. Unfortunately, there is no
way to fine-tune the increments by which they adjust. Note that these
shortcuts will work only if a text selection is made; selecting a type layer is
not enough. To change the type size by increments of 2, press either
Command + Shift + < or >. To bump the increment up to 10 points, use
Command + Option + Shift + < or >. Leading can also be modified by 2 or
10 point increments using Option + Up or Down arrow or by Command +
Option + Up or Down arrow.