This is almost done already (in the ajax-paging branch).
What is left to do is maybe adding a spinner or some kind of similar feedback, and more testing:
[x] check paging on a page with multiple grids
[x] check ajax paging is disabled when a cell rendererBlockName is
This is almost done already (in the ajax-paging branch). What is left to do is maybe adding a spinner or some kind of similar feedback, and more testing: