"remember playback position" for iPod?

Apparently Apple uses a "non-standard" mp3 tag to set "remember playback position", which can be set on any track in itunes - music, audiobook, or other.

When synced to my iPod, this means that if I get partway through a track, go listen to something else, when I return to that track it starts where it left off. Very useful for audiobooks, but also for old-time-radio dramas, and for other long tracks (lectures etc...)

I have been told that Apple uses a "non-standard" tag to turn this on or off. Of course, I'm shocked, shocked that Apple would do anything non-standard.... or maybe not....

In any case,is there anyway to access this field from mp3tag??