When we have huge stockpile of items and we want select/deselect all items from specific category like for ex.
- missiles
- wands
- scrools

we must press key for every single item from that category like: ABCDEFGHIJIKLMNO many times

Why not implement selecting deselecting all items from specific category pressing category key.

keys for specific categories are already defined in extended drop ':d' menu

example selection filters:

! - for cursed items
+ - select all
SHIFT+S - for scrools
SHIFT+M - for missiles
SHIFT+A - helmets
SHIFT+Q - wands
SHIFT+B - All armour parts
etc...

That should really speed up picking up desired items.