Tasks categories. Unable to modify another user's categories.

Hello
With outlook 2003 our office used our task lists to pass tasks between
staff. At any time, anyone with proper permissions could go to my task list
and create a task making the "category" whatever they typed.

Now, with outlook 2007, other users must choose from categories which I have
already configured. When you go to "all categories" the options for "new",
"rename", "delete", etc are greyed out and unavailable, even if you have
"owner" permissions on the mailbox and task list. In order to modify the "all
categories" that user must be logged in as theirselves.

Hopefully I have presented my problem clearly.

Is it possible to allow other users to modify my "all categories" so that
they can create categories which I have not yet setup?

Is it possible to get rid of the colors and go back to typing in the
category every time like we did in outlook 2003?

Thanks for the help

Tommy
SynEcology - MS Gold Partner