McNamara, who is doing his best to keep his young stars focused on maintaining their phenomenal form and under contract at Tannadice, was pleased as his team claimed not only their fifth consecutive win but amazingly their third on the trot when they have scored four goals.
Dundee United made heavy weather of making it five consecutive wins, claiming an incredible 21 goals in the process.
Gabriel Reuben was sent off after 22 minutes with a rather harsh first yellow card followed by a second inside five minutes, reducing the home side to 10 men with three quarters of the game remaining.
McNamara said: "The players haven't spoken about scoring four goals in games recently, they are just interested in keeping going to the final whistle.
"We are always confident of scoring, whether in the first minute or the last and even when the subs come on the are keen to get involved and grab a goal."
Although it took three goals in the final 15 minutes to finally overcome Kilmarnock, who played three quarters of the game with 10 men, McNamara had no sympathy for the number of yellow cards the opposition picked up.
He said: "The elements made it difficult and we told the players at half time to keep playing football and moving the ball quicker as the play was condensed in the first half.
"Obviously that led to a lot of bookings but I don't think Kilmarnock can have any complaints as we have turned their players and the referee has been on the spot, including the red card as Stuart Armstrong was twice getting away from his opponent."