can I export a subset of my tasks to a google calendar ?
unfortunately, the iCal feed transports all tasks to the calendar software and you can't choose which tasks you want to use with Google Calendar right now, but thank you for your feedback, we appreciate it and will consider adding such option in future development.
You're welcome to add a request to our Votebox:
This something I would love to see added as well. There is a suggestion already in place to add this feature. If you haven't already you may want to place a vote for this feature. https://todoist.com/Vote/showProposal/249/