I like this plugin very much.
I have tested this plug in up to Version 1.2.1 on IE, Opera and Firefox.
It is functional and practical as is and I will continue to use it.
Anyone with access to the dashboard can edit/delete any task. When "Task Update" the "by" field shows the name of the last person to edit.
To avoid confusion I recommend restrict Edit/Delete to the original person who "Add Task".