rolling(timewindow, center=True) using .shift(freq=...)?

[N4321D]

When using
ddf.rolling("1S", center=True).mean()
or some other time window there is an error:
TypeError: unsupported operand type(s) for //: 'str' and 'int'

but ddf.rolling(5, center=True).mean() works.

i don't know why it doesn't work exactly for time windows, but an easy fix would be to run:

window = pd.Timedelta("1S")

ddf.shift(freq=-(window / 2)).rolling(window).mean()

Would it be easy / worthwhile to implement this in the rolling function so that time windows work with center=True?