What's possible in hints file?

[Stefan A.]

Gurus,

normally, I would do a short check, but currently I've no connection to one
of my running FR, but have to plan some extensions. 
Has someone of you done something like the following?

Regarding 'hints' - file: Would it be possible to use 
- $INCLUDE /path/file?
- Fall-Trough?
- temp A/V pairs defined in the global dictionary file using an ID > 3000
and using them as %{My-Attribute} later on?

Thank you.

Regards 
Stefan