These days we are busy with implementing the feature requests from our PrimeFaces PRO users. One such request is inline cell editing similar to excel. Inline row editing is a popular feature of PrimeFaces as it enables to modify data easily, cell editing is similar to this but is enabled by double clicking on a cell. A cell is saved instantly on blur or enter key events. Optional cellEdit event is provided as an ajax behavior to do processing of old-new values on bean side, context menu support is enabled as well for right click options.
Demo is available at PrimeFaces Labs. At the moment, this is a work in progress and we have more work todo before finalizing like multi component support and better visualization of validation errors.
There are many sponsored features for 3.5, keep an eye on this blog for the upcoming goodies.