ok, I've figured out that this is indeed the case:
https://www.mail-archive.com/freesurfer@nmr.mgh.harvard.edu/msg23348.html

Also, following these instructions I was able to get RAS from the tkreg RAS in FreeView:
https://mail.nmr.mgh.harvard.edu/pipermail/freesurfer/2012-June/024293.html

Thanks,
Noam
From: freesurfer-bounces@nmr.mgh.harvard.edu [freesurfer-bounces@nmr.mgh.harvard.edu] on behalf of Peled, Noam [NPELED@mgh.harvard.edu]
Sent: Wednesday, March 08, 2017 9:27 AM
To: Freesurfer support list ý[freesurfer@nmr.mgh.harvard.edu]ý
Subject: [Freesurfer] Yet another freeview coordinates question

Hey all,
When loading two T1 in freeview, one for a subject and one for fsaverage, and switching between them, only the tkreg RAS coordinates changes while moving the mouse, not the RAS.
Does it mean that the RAS in freeview is always in MNI305?

Thanks,
Noam