option to colour code each project
a feature to colour code tasks for different projects so it is clearer in calendar view which tasks relate to which project.
Invite people with link
An option where you can invite someone via a link rather than entering their email to sign them up. This would be useful where you can't get the email address of each person who needs to be invited.
Due tasks email
An email that will be sent daily if a user has tasks due on the day, next day or overdue.
Google Drive Integration
Having the ability to integrate G-Files via link form google drive. This will provide access to the file w/o taking away storage space.
Mention people in comments
You will be able to mention people who are part of a project whenever you comment on that project. When the notified person receives the comment email it will be highlighted to show them that they are mentioned in that comment.
Add multiple companies to each project
Adding multiple companies to each project will let you bring more than 2 teams together to work on each project.
Company profile page
This will show details of the company along with all users and projects attached to this company.
View Completed Tasks
It would be very helpful if the system remembered your preference (or last selection) or different Task View Tabs. It doesn't remember my selection, and each time I come back to a page I am required to check this selection. This is not an option on the Calendar View of Tasks as well, which would be nice.