Hmmm. Now that you mention it, I can see where that would be handy for people who import long video clips and spend a lot of time working smaller sections of it. But sadly no. There is no menu item to attach a shortcut to as far as I can tell.
I know which key I would use. I would use a forward slash "/". That is what used to size timeline view to just the duration of the clips if I recall correctly. It is now used for "Mark Selection".