Other than completely agreeing with Roger (if someone made a tablet that just did spreadsheets, I can't imagine how excited you'd be to got get one), your system fails one of the basic requirements of task management (which I admittedly didn't state): that it show me all the tasks I can perform right now.

Quote:
1.000 Task 1
1.100 Task 3 (Dependent on task 1.000)
1.110 Task 5 (Dependent on task 1.100)
2.000 Task 2
2.100 Task 7 (Dependent on task 2.000)
2.110 Task 8 (Dependent on task 2.100)
3.000 Task 4
4.000 Task 6
5.000 Task 9

In that list, I can perform tasks 1, 2, 4, 6, and 9, but I have to scan through the whole list of every task in order to discover that.
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Bitt Faulk