Personnalisation Open Source Flyspray

Spécifications en anglais:
Flyspray s'installe en 2 minutes sur un serveur, environnement PHP/MYSQL

We would like to customize Flyspray as follow:
- add our company logo and remove the Powered by Flyspray 0.9.9.6
- add a new column in the “Task List” called “Last edited by” . This would inform of the last person who edited a task
- add a new column “last edit time”. This would inform of the time HH:MM:SS of the last edit
- is it possible to show project to specific users only? If no, this would have to be implemented.
- Hide the roadmap link
- When adding a new task,
Hide task type, category, status, operating system, severity, priority, reported version, due in version, due date and private.
Assigned to would automatically be assign to the user who create the task.
Task are private by default when created ( I only want superadmin and the assign user(s) to be able to view a task)