The main thing aspect of motor development which affects literacy is, of course, fine motor control.  Fine motor control is needed for handwriting and for mouse control or keyboarding.

How does Steps develop Motor Development?

Steps is not specifically designed to develop motor control as such, although there are plans for a touch typing course.  However, there a few features which develop this aspect, including kinaesthetic memory (memory for movement).  The workbook courses include a strong emphasis on handwriting and letter formation and the teaching method for high frequency/irregular words develops kinaesthetic memory.

Blocks (game) – spatial awareness, quick thinking, fine motor skills
Clear the Skies (game) – spatial awareness, mouse skills
Alphabet (reference) – kinaesthetic memory for letter formation, handwriting