Working on the parser tonight, I quickly realize that I needed to define a relatively small subset of English to handle.  I brainstormed up the following list of Scribbler-relevant commands:

Verbs:

go move drive roll stop turn rotate accelerate decelerate “speed up” “slow down” “back up” beep sing dance wander

Nouns:

light lights forwards backwards left right middle center reverse second seconds millisecond milliseconds degrees percent obstacle object

Proper Nouns:

i me you scribbler

Numbers:

0-? zero one two …

Adjectives:

maximum minimum fast faster slow slower quickly slowly

Misc conjunctions:

then and or

Funny:

love hate don’t

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Even with such a limited subset, this parser may be more work than I had imagined just due to the sheer number of combinations…