Scheduled Project - Date override

It would be nice if I could override the date(s) found in the workspace within the New/Edit Project screens. 

For example, we have some workspaces which people receive daily (using "This Month" or "Last 30 Days" as the default setting).  However, another group get that same report at the beginning of the month for the previous month (using "Last Month").  This requires me to keep and update two separate workspaces.