Set same publish date for all channels

We currently have 6 channels and for each block we want to publish (or un publish) at a specific date our editors have to set the same date and time for each channel. In the block settings under the "Channel" tab it's possible today to select all channels but you have to set start and/or end date individually for every channel but we almost always publish to all channels at the same time.

It would be great if there was an option here to set start and end date for all channels at once. Maybe add a DatePicker in the Start end End headers of the table and if the user set a date there it will propagate to all fields.