/hurt, a way to detect sword swing cool down.

Both of these would be revolutionary to the command community. A /hurt command, that you can put custom death messages with selector comparability like /say has. Also modify damage, knockback (the knockback will center around the location of execution) and if it ignores armor. A way to detect sword swing would be so useful, if it's spellcasting, or to simply playing a sound. That's my pitch. Cheers!