The modules that it is possible to change the sync settings for are Leads, Accounts, Contacts, Vendors ,Campaigns, Sales Order, Organizations, Oppotunities,Torouble Tickets, Project, Project Milestones and Project Task modules.
As of now, Calender and Comments are automatically synced.
Please contact us if you want to change the Calender setting so as not sync and I will change the priority of my next scheduled update task.