I have come across the same issue.Solution is we need have a column in table which specifies role.
Get the list of menu items that should be disabled.Have it in List.Then pass this list to js as an Array.

In DynamicMenu.js file access that array elements and call your function then add this foollowing lines there....

document.getElementById('mi_' + this.container.id + '_' + menuid).disabled = true;

IF any queries post it.

Thanks,
Venkat.