My original request was actually for something very simple: just select the touched tracks along with time.
The "Arrange view: right drag" mouse modifiers already include options such as:
* Marquee select items
* Marquee select items and time
* Add to selection
etc.
I would simply like an additional option for selecting tracks, so that these options can be combined into:
* Marquee select time and tracks; or
* Marquee select items, time and tracks
This would be useful for actions and scripts that affect selected tracks within the time selection. For example: