Not sure if it is of interest to anyone anymore, but running into the same problem I have come up with a solution: remote tables.
Let's say I need a list that allows selecting one of the incident categories.
I'd create a remote table with one column: Label (u_label) - make this the display value.
Sys ID (sys_id) is added automatically by SN.
I'd than add the definition for the remote table as:
(function executeQuery(v_table, v_query) {
var $chl = GlideScriptChoiceList.getChoiceList('incident', 'category');
$chl.removeNone();
for (var i = 0; i < $chl.size(); i++) {
var $ch = $chl.getChoice(i);
v_table.addRow({
'sys_id': $ch.getValue(),
'u_label': $ch.getLabel(),
});
}
})(v_table, v_query);
Not I can use this remote table as reference for the List field - sys_ids will actually be choice values.
Also don't forget to add proper ACLs to the table, so that users who need to be able to work with these "choices" can too.
Of course this works in global and you'd need to "shim" it (move the logic of returning the array of records into a globally accessible Script Include in scope "Global") to work in private scopes.
