Brisbane opened up a 10-point gap at the top of the standings with the 2-1 win over Adelaide United at Suncorp Stadium on Sunday, with just five regular season rounds remaining.
A pair of Besart Berisha goals did the job for the Roar, who almost kept a clean sheet but for a late Jeronimo Neumann screamer.
Berisha's strikes came either side of a controversial moment at the end of the first half, when a long-range effort from Thomas Broich hit the crossbar and bounced over the line, but was not awarded as a goal by the officials.
"It's all hands on deck for every team," he said.
"Yes, we've got a bit of a lead, we accept that situation gladly.
"We've worked damned hard for it. We've really, since I think June the third, have rolled out sleeves up, come in and set this opportunity up for ourselves, and as I said to the lads today, there's a door open now, are we going to step through it?
"And I think we really stepped through it today."
On the disappointment of Brisbane being denied a goal for Broich's brilliant effort, Mulvey said it was time for the Football Federation Australia to consider using goal-line technology.
"That technology exists and we should see if we could get it here," he said.
"Maybe it's a little bit pricey but things like that are things of beauty - a strike from 30m and it's 2-0, it changes the game.
"I can be quite calm about it because we've won the game but there's going to be a time, an instance, where it will cost a coach a game or a place in the finals and its not right in today's day and age."
