Changes to JavaScript

There is a valid code in the program (site) you need:
(1) Field "Dispute" - remove user verification, i.e. Now this field is active only for the user who added the task, and it is necessary that the field is active for everyone.
(2) When assigning a task - WITHOUT the performer - this task cannot be changed by anyone other than the user who added the task, it is necessary that such a task can be changed by anyone who sees it.
It is necessary, where and what is changed, the ability to transfer the existing database to the new functionality.