Erica--
That would be awesome to have!
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It solves many problems with full sync:
There is no need to have dedicated server for this since Google does it for us.
There is no need to implement not-so-easy two-way sync...
There is no need to have online access to html5 web app - offline support is a must!
I have no problem to support developers with fee for pro version. I prefer one time charge over monthly payments for obvious reasons.
Thanks for the great app!
Elizabeth