[Feature request] Autocomplete for unavailable apis

[TotoShampoin]

Basically, I have an advanced computer, a non advanced turtle, and a floppy disk. I would like to use the advanced to write a program that will be used by the turtle.

But due to the advanced computer not being a turtle, I don't have autocomplete for the turtle api

Would it be possible to have an opt-in setting for it, maybe?