As explained in a previous post http://empeg.comms.net/php/showthreaded.php?Cat=&Board=bigs&Number=53825

The Seek Tool will only store a profile for a track it has completed profiling - Until the profile is complete the data it has accumulated so far is too low resolution to be able to piece it back together and continue where it left off for a track.

It is unlikely that in the foreseeable future the profiled information will be stored at a high enough resolution to make it worth storing partial profiles.