Perhaps this is already possible?
If not, a really great feature would be a way to track team and member workload globally for the entire company. So across all collections.
For examples. Let's say you have a team of 10. Half of those are marketing, sales and over-head. The other half are project delivery.
You might have a collection for marketing, another company overhead and sales. And then a bunch of project collections. Each with their own complexities and assignments of cards and estimated time frames on cards and/or members on tasks.
It would then be great to get a sort of "member work load" view. A global view where you get the list of all members (and external members) with a timeline type of view. So you can easily see who has enough work, too much or too little. And with a hint or relationship to which card(s) or collection(s) that that allocated time is for a member.
Perhaps this needs to be done on a collection basis. And then that can propagate into a "overhead dashboard". So in the end, when everything is correct pushed to that dashboard. You still have a company wide overview of workload.