This program is at the state where I am regularly using it, and it definately is workable. That said, it does not include all of the core features required to make it an adequate alternative to people who have a to-do system they like, and as such I am regularly making breaking changes. I don't recommend it if you want a stable to do system (yet, although I will update this message when that's no longer true) but if you like some of the ideas here and want to try it out, feedback is welcomed.
The general idea of Toru is to have a to-do app which uses distinct, mutually exclusive vaults of tasks with configuration which is in a human readable and easy to export and import format (to completely separate personal, work, study, etc), however within a vault, to use tags and dependencies as a means of organising notes, rather than mutually exclusive folders.
For example, in a given vault, one may have a big project they are working on. This project, and all of the subtasks are listed together on the top level (and not organised according to projects). In order to conveniently organise and view tasks, use tags and dependencies, and filter searches for tasks to get the desired information. This allows you to categorise tasks even when they do not fall into any one obvious category.