jQuery Grid Plugin - jqGrid

I would suggest the possibility of having multiple roots when using Nested Set. particularly was working with PHP Doctrine ORM http://www.doctrine-project.or.....al-data/en
This Orm offers a chance to store multiple trees adding root_id column other than "LFT", "RGT" and "LEVEL".
    
At the moment my solution was to adapt the response of the ORM to use the model of 'Adjacency' of JQGRID.
i suggest add an optional parameter (root) in the nested set model and with this allow multiple native roots, obviously I know the great work that is required and not just pass an additional parameter

Thank you very much,