jqGrid colModel contains read-only multi line column defined using properties below. Content line lenghts are greater than column width, text is to long so that tooltio does
Is the setting
editable: true, editoptions: { readonly: "readonly" }
probably what you need?
UPDATED: Free jqGrid supports more values for editable property starting with version 4.8. The wiki article described that editable can be function and it supports additionally three string values in case of using form editing: "hidden", "disabled" and "readonly".