You can read my reply to wallflower above, but the problem with my assumption was that these were "hard" breaks, not just "time I'm not actively typing something."
Other than that, I've found that even non-coding tasks tend to be typing tasks for me. I almost can't stand writing by hand anymore since it just feels so slow by comparison.
That said, with my wrist issues I think of writing as being a task in the same abuse category as typing. My wrist only flared up after I had written a lot by hand for the first time in months.
That said, such software would drive me insane.