Provide a contact form to contact users - especially ones with hidden email addresses
Unless I am missing something (I'm using version 1.4.4), there does not appear to be any way for a non-admin user to contact another user if they have hidden their email address.
There should be a simple form to send an email to a user while keeping the email address hidden. Should be on the page you get when you click on a user.
It would also be helpful to have a similar way to email all users on a project at once, although this should have a different permission setting assignable in roles so that it could be limited to only other project members, etc.