Time tracking of business development, administration, accounting, invoicing, and other non billable activities?

I'd like to use FreeAgent also for time tracking of own:

- business development
- business administration
- accounting
- invoicing
- marketing, pr
- et cetera

It's important for me to have a complete overview of my hours spent, as in the Netherlands one can get tax discount if the number of hours is more than 1225 per year.

How do I track these unbillable activities? Just by creating projects (e.g. corporate activities or something) with a billing rate of zero - so that the tasks/timeslips related to this project are not billable?

Or am I overlooking something?