Split the 'Status' search field
Currently, there is no way to do a disjoint search over a single field. Normally this isn't a problem since you can use the list selection to get what you want. For 'Status' however, there is an extra property of each status as to whether it is 'open' or 'closed'. A search for something like "open, but not in feedback" isn't possible without knowing which statuses are open and which are closed. The simplest thing I can think of is to add a search field for 'Status Type' which would search on the open/closed flag of the issue's status field. Alternatively, adding support for disjunctions over a single field would be useful (and more general to boot).