This might be relevant:
https://github.com/tstojecki/SharePo...r-Sencha-ExtJS

Ext 4.1 proxy interacting with a custom SharePoint list via odata. The code is available on github, the sample has a grid with inline editing, sorting and paging all going against listdata.svc using the appropriate http methods (rest).

Feel free to post a comment or contribute on the github page.