Thank you for your post.
Having checked around here, we do not have a list of the Runtime commands.
The reason for the PDF exclusion is because of licensing. Just about all other commands that are not networked related are safe to use.
For the internet, you can go into ScriptMaker and check the option "Indicate web compatibility" at the bottom to see which script steps are available.
Sorry I can't be of more help.
Thank you for checking around to see if there was such a document. I appreciate it.
In FM Advanced 10, there is a comparison chart FileMaker - Runtime. Check the document: fmpa10_development.pdf.