My script

# counts kills per life and in total
# idea by Tisra

variables:
	{kill counter.%player%.kills_session} = 0
	{kill counter.%player%.kills_session_max} = 0
	{kill counter.%player%.kills_total} = 0
        {kill counter.%player%.kit_points} = 1.00

on death:
	attacker is a player
        add 0.25 to {kill counter.%player%.kit_points}
	add 1 to {kill counter.%attacker%.kills_total}
	add 1 to {kill counter.%attacker%.kills_session}
	{kill counter.%attacker%.kills_session} is greater than {kill counter.%attacker%.kills_session_max}:
		set {kill counter.%attacker%.kills_session_max} to {kill counter.%attacker%.kills_session}

on death of player:
	set {kill counter.%player%.kills_session} to 0
on death of player:
	attacker is a player
	add 1 to {kill counter.%player%.kit_points}
command /kills:
	executable by: players
	trigger:
		message "You have killed %{kill counter.%player%.kills_session}% in this life!"
		message "Your maximum kill streak is %{kill counter.%player%.kills_session_max}%"
		message "You have killed %{kill counter.%player%.kills_total}% in total!"

command /kitpoints:
	executable by: players
	trigger:
		message "You have %{kill counter.%player%.kit_points}% kit points!"

command /freekit <kit>
        executable by: players
        trigger:
                {kill counter.%player%.kit_points} is less than 1:
                message "You don't have enought kit points!"
                exit
                message "You just used your kit points to get a kit!"
                make player execute command "/kit %arg 1%"
                add -1 to {kill counter.%player%.kit_points}