It would be useful to be able to have a cross channel tag that I could apply to tasks.

Examples of how I would use this:

As a customer success manager, I use my customers as my primary channel structure. I want to be able to organize my cards cross-customer without losing the cards association to the customer.

I have tried creating a secondary context for each customer called "Quick move" so that I can see all my quick move tasks across customers. This was useful but it was inconvenient that I had two separate channels for a single customer and couldn't view both channels together. A multi-channel selector would have also solved this issue.