jQuery Grid Plugin - jqGrid

Any idea how to implement order detail edit grid.

This grid should be like excel:

1. preferably up/down arrow keys move to previous / next row and start cell editing
2. All cells are always in edit mode or edit mode starts if up / down arrow key is pressed or cell receives focus
in any other way.
3. tab moves to next cell in row
4. Submit button sends all rows to ASP .NET mvc controller in server

Is it reasonable/how to implement this using jqGrid ?
All jqGrid examples which I have found does not allow to use up down arrow keys to move next / previous row if in edit mode.
Where to find sample code for this?