Hi Joe and Jean,
It's now up to us to create our own water runways and populate them with amphibious AI.
For starters: Holger (Sandmann) created a float AI primer years ago (should still be available at Avsim or Flightsim.com) which formed the basis of his work in MF, TF and GB v.2. Download a copy and have a go at designing your own MF/TF/GB AI traffic.
It's becoming obvious that FS9 users are going to have to band together to design our own addons as development at RTMM moves forward with FSX/P3P/XPlane et al.
Dorian