jQuery Grid Plugin - jqGrid

Suppose we have:

jQuery(document).ready(function(){ ...... 

 {name:'poet', index:'poet',  align:'right', editable:true, formatter:'select', editable: true, edittype: 'select', editoptions:{v

alue:"1:Alighieri;2:Omero;3:Virgilio"}

.....

jQuery("#list").jqGrid('navGrid','#pager',{edit:true,add:true,del:true});.

Now  suppose that there may be two records with the same name and in the display table I have two record (one with Alighieri and one with Omero). When I switch in add mode via navGrid, I must update editoption from editoptions:{value:"1:Alighieri;2:Omero;3:Virgilio"} to editoptions:{value:"3:Virgilio"}. In this manner I hope that only Virgilio name is in list. When I exit from add mode or when I refresh data view I must update the editoption value.

Is this possible ?

Is there a manner for make this?

Regards.

Giovanni.