That's odd, it should already show only non-banned users.
Anyway, for the second thing, try the following, it is untested and there is a high chance it won't work since I'm very tired:
Open ubb_lib_ci.cgi.
Find:
(!$permslist->{$_}->[0] && !$permslist->{$_}->[1] && $permslist->{$_}->[2]) ? $_ : ""
Replace with:
(!$permslist->{$_}->[0] && !$permslist->{$_}->[1] && $permslist->{$_}->[2] && $pdns{$_} ne 'yourpdn') ? $_ : ""
Now replace 'yourpdn' (not including the quotes) with your display name, such as 'IguanaJoe'.