It may not be obvious how to call Smalltalk code from Etoys. It's rather simple.
Any object's script can be changed to Smalltalk text and then more Smalltalk code can be added and saved there.
For example, attached are photos of the button script that moves a Star object to a position on the World coordinates.
Selecting the White menu button in the top right corner you get this menu:
Choose "show code textually" and you get the Smalltalk equivalent.
Now you can replace the Smalltalk code that moves the star with the Smalltalk code you want to execute to load the CSV file ... into some text object for example.
- Darius