Hi Bob,

Here's the code you need to use for the Updating ColumnSettings of a given column in order to set custom values for the groupSeparator and decimalSeparator:

.Features(feature => {
    feature.Updating().ColumnSettings(colSettings => {
        colSettings.ColumnSetting().ColumnKey("DelegatedSpace").EditorType(ColumnEditorType.Numeric).EditorOptions("decimalSeparator:'!',groupSeparator:'^'");
    });
})

Also, here's the code you need to change those value at runtime (resetting them to empty strings, based on your scenario):

<script type="text/javascript">
    $(function () {
        $("#Grid1").live('iggridupdatingeditcellended', function (evt, ui) {
            if (ui.columnKey == "DelegatedSpace") {
                $(ui.editor).igEditor("option", "groupSeparator", "");
                $(ui.editor).igEditor("option", "decimalSeparator", "")
            }
        });
    });
</script>

The trick is that no matter what ig*Editor you are using, you will always need to configure the igEditor and not the ig*Editor - this is especially true in MVC scenario .
Viktor Snezhko (the creator of the igEditors) has pointed this out several times in the forums and I do believe that it's also mentioned somewhere in the official Developers Guide.

PS: I'm attaching an MVC3 (sorry - it's the only one I could put up on such short notice) sample illustrating the code I've provided. 

Cheers,
Borislav