ModelAdmin list_filter questions

I am using the latest Django 1.2 release. Can someone please confirm
if the ModelAdmin's list_filter supports these capabilities:

1) Multi-Value-Select: How to allow multiple values to be selected for
the SAME filter field - i.e. I want to display all records with a
"status" field of : "Active" OR "Pending" - but it doesnt let me
select/highlight more than one status value.

2) Not-Empty/Non-Null Filter: How to allow filtering based on: non-
empty or non-null values - i.e. I want to display all records where
"status" field is not null.

3) Custom Filter Definitions: Can we define any custom filters that
would appear on the same filter list - that the user can dynamically
turn on/off. For example - can I define a filter for: [ field1 in
('A', 'B', 'C') OR field2 like '%xyz%' ] ?

Any insight on how to expose such functionality will be appreciated.

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