Add filter to show only project-level time

[#1]

We are in the process of implementing time tracking, and in our current maturity model, we only want to track time on the project level, not at the task level (I know we'll get there soon, but for the sake of simplicity....). Can we add something under Preferences, or even a simple filter, to remove tasks from timesheets? And have that be determined on the Group level?