I was wondering if you've ever considered adding a facility to Calsync to be able to easily export your calendar from LN to Google. e.g. I have about 10 years history (work and personal mixed) on my LN calendar and am now moving jobs.
I know you can export using a CSV file, but to get a decent number of fields to export, you have to create your own calendar view with these in it for it to work well.
Just removing the 30 month limit on syncing into the past would be a start -and make it possible by running once with a particular "export" calendar and then changed back to the normal calendar.