Adopt a board/project hierarchy model
On many occasions multiple projects can be can be included in customer order, which is then recorded against one salesforce opportunity.
These projects may not always run concurrently even if the tasks for each project are the same.
Being able to create sub boards and tasks, then track overall status and percentage complete at the parent board level, would be a great addition to the taskfeed feature set.
Jonathan Sidhu commented
Have a 'portfolio' level view board with cards linking (and drillable to) child boards for specific project with their related tasks.