alt Hacker NewsI didn't know about that one, looks neat. Thanks.
Sums of cages and selected numbers (even outside of killer/sandwich) were a must have feature for me, so I implemented those features early. Also combinations are available for single cage or multiple selected cages and for selected sandwich.
Something I wish DKS did better was Fill. If you have selected a cage and press F, it will fill the cage with all the possible combinations on the right panel. Instead, I think it should take only the ones you haven't ruled out by de-selecting them.