autocomplete on the project name would be a nice feature. something like @pro and then it brings up a list of projects that start with pro. You could also do the autocomplete of the other interesting things such as team members and time.
One complaint I hear all the time from people I have worked with is the lack of autocomplete features so this would be a big win for your usability.
1. Create a project with a space in its name "project name"
2. Add a task to that project and only the first word is tagged as @project