Hey Harry,
I don’t think such an option is justified.

Why is 1s too much data for you?
I have logged 12hrs in 1s step and it was about 3MB, which is really not that much…

Or is it about the post-processing, eg. analyzing and visualizing?

If so, you might be interested in this scilab script which I wrote:

Scilab Script for visualization of Mooshimeter Log files

cheers
richard
(auch aus ‘Schland :-)