Can DateBk6 read the Franklin Covey Task List instead of the regular ToDos?
No. The Franklin Covey Task List is stored in a proprietary database, the format of which has not been published (to the best of my knowledge). It is not clear that reverse-engineering of their database format would be permitted and even if it were, it would require a completely separate version of DateBk6 to manage it. Note that DateBk6 now supports an Urgency field which allows you to implement a Franklin Covey style of matrix of priorities and urgencies. Note that this is not intended to perfectly implement the FC system, because the desktop only displays priorities, so the urgency field is used to handle the A/B/C/D designations, but it will definitely help those users trying to more closely copy that style of managing tasks.