> The timedelta type is fundamentally an integer type.

I disagree strongly with this, and find this a bizarre point of view.  Regardless of how the timedelta is stored internally, it's used to represent physical times.  I doubt there are many applications that care about the fact that each timedelta is an integral number of microseconds.

Multiplication or division of a time by a float or int makes perfect sense  physically, and I think it should be a legal operation here.