So I discovered something interesting in QFG2, KQ1SCI, and the Seasoned Professional. It's some evidence of an early point-and-click interface.
The following verbs are featured in script 950 (FEATURE.SC):
Look
Open
Close
Smell
Move
Eat
Get
Climb
Talk
Was Sierra originally going to use a LucasArts-style GUI? Many of them were merged into a single "Do" verb.
I know QFG2 regularly uses this early doVerb method, possibly forwarding parser commands to this.