I've been busy with work this week and not had as much time as I would have liked to work on this, but today I figured out the Titanium OPcode to flag a task as complete (which is different from 6.2) and make it display the green 'Task Completed' message (I think I have found the struct values to make it display 'Task Failed', but I haven't got around to testing that yet.
The more astute amongst you will note that the 'Children of the Fay' task does not finish in Kurn's tower, however I used a bit of 'artistic license' is setting the task goals during development.
There is still quite a bit left to do, but the system is now functional end-to-end for tasks with talk/kill and loot activities. Hopefully I will get a lot more done over the weekend.