Bootcamp River prefab with standing water on sides ?

Hi,

if you have a look at the river prefab in the bootcamp demo , it has waves that go up and down, uvscroller for the texture to slide over the river.

But i want it to make that only in the middle the water scrolls and have waves , and a small length on the sides that doesnt scroll the texture and have waves.

How do i do that ?

NOTE : i already tried to make it myself in maya. as the technique they used , to make tha river was that they had a plane and rigged it with joints and then weighted it.

i already tried that to do in maya , but this only in the middle and on the sides i had 2 sepperate planes , but the problem was , that i don't know how to connect those 3 planes together , but still the option to attach a different shader to each plane.

Anyone have any expirience in maya (2012)