For sure just unracking and holding a supermaximal load can help. Mainly justy with confidence/mental things of Holding that weight. But also getting thew body used to HEAVY loads. Try it sure at the end of workouts load on 20-50 lbs more than your max un rack and hold. Or do it prior top a set. unrack hold hell maybe even do a c eccentric then use your expected load and it'll feel like cake.
Use it dont abuse it. Something to add in for sure.