May I make a suggestion for an additional filter for NOTAMS?  While I understand that for helicopters and some low level flyers these are very important, there are many NOTAMS now applicable below say 1000 feet and I would like to be able to filter these out and concentrate on the more relevant ones to my flying.

In that case if you've planned a flight at 2400 feet everything up to 400ft will be shown, this is by design. You can always change the vertical bit if you want to see fewer NOTAMs that you're flying clear of vertically.