I would like to see the ability to have more than one template for edit AND update on grid pop ups. Currently I can set the template file for the editable option but that is also used for the create when doing a pop up modal.
I just created a command column with a button in it that kicks off a jquery dialog then I can put whatever I want in that. Maybe that would solve this problem for you. Or use multiple commands, one for each template you want to pop up.