According to http://wiki.lyx.org/LyX/NewInLyX16, "Users are invited to make suggestion as to what should be saved additionally in the session information."
Instead, I'd like to suggest improving the session management itself: the ability to store/restore multiple sessions on demand (and not only on closing/reopening/crashing LyX itself) will be very helpful, especially for users working on a lot of inter-related documents simultaneously. What I mean is somewhat close to the "Session Manager" extension for Firefox. Well, the screenshots are self-explanatory, especially the first one is a nice approximation of what I have in mind: http://sessionmanager.mozdev.org/screenshots.html I'm not really sure if it isn't too late for 1.6... but maybe for 1.6.1? BTW the list of new features listed for 1.6 is really impressive! Almost everything that I was forced to achieve via scripts (sometimes even including awk working on lyx and resulting latex documents) can now be done inside the application itself. LyX is an excellent example of the efectiveness of FLOSS, when done right. Best regards, MichaĆ Skrzypek