Yes, you can. Just make sure that data model returns proper rows count on subsequent request (see livedemo examples -data model using data provider for more info).
I have absolutely same problem. I've create extending ExtendedDataModel class, implement all abstract methods and it works fine for me for first load, but when I try to go to second page, no one action for datascroller fires and I don't know how I should load secobd part of data.
I'm newbee with JSF and Richfaces, so could you please give a link where I can dowload any examples how to work with datatable and datascroller in such cases?
Visit the link in my signature. There you could find the link to richfaces-demo sources. Download and explore table models samples.