Hi Will-

I've done something like this with individual users but not a group. Luckily, for the users in question there wasn't a lot of turnover so it wasn't terrible. Hopefully there's a better answer, but here's an example of what I did.

1. Default a field to the current user token
2. Set that to uppercase and then compare to an array I maintained of "power users"
3. If the user was not a power user, hide a table column. I did this hide vis JS but probably could have populated a field that then triggered a field rule

Note: if there are future steps in this process that also require that kind of logic, you'll need to use a different field for current user or reset it when the form loads (unless there's now a JS token for that info)

var currentUser = $('.CurrentUser input').val().toUpperCase();
var powerUsers = [];
powerUsers = ["LFADMIN", "DOMAIN\\USER1", "DOMAIN\\USER2"];
if($.inArray(currentUser, powerUsers) == -1)
{
	$('.ProductTable tbody .HideLine').hide();
}