Yes, the S comes with all of the bits to make it a Biposto. Ordered my 1098s today and checked out the size of the 'bird table' which will only take the smallest of birds....
I reckon the addition of the pegs will take about 5 minutes and the swap between cover and seat pad, about 10 seconds. Really seems to be the best of both worlds at last....
They're all bips,@ the mo,steel subframe the lot !,just remove them straight into the bin,as wifes/girlfriends arn't allowed on,or near them,if only to assist applying zymol,its the law !!!