I'd answer that as yes they make stations that charge at the maximum rate and the maximum rate the Leaf allows is too much (assuming you own your Leaf and care about battery replacement costs).
If I was using an L3 and I had the option I'd limit the charger to 36KW if it was cool out and even lower (as low as 24KW) if it was hot outside.
I say this after reading every page of the 675 page battery thread here and comparing to Tesla charge rate limitations
Supercharger charge rates in terms of C vary
90KW / 85 KW (90 KW supercharger on model S with 85 KW battery) is only 1.05C
120KW / 85 KW (120 KW supercharger on model S with 85 KW battery) is 1.41C
90KW / 60 KW (90 KW on model S with 60 KW battery) is 1.5C
105KW / 60 KW (120 KW supercharger limited to 105KW on model S with 60 KW battery) is 1.75C
But it only charges that fast until the taper kicks in and then only if you are the only car on the charger. Making sure to get the 2nd cable on a charger could ensure a slower rate of charge but wouldn't be an option if a second Tesla isn't present when you are charging.
I have to think since they don't allow the 60KW battery to charge at 120KW that the charge rate above 1.75C is unacceptable to Tesla. 1.5 seems to be OK in their eyes.
The thing to remember is that some of the Model S cars will have fans running extremely loudly during supercharging. Active cooling you could hear from across the parking lot. The Leaf has no such active cooling so fast charging needs to be limited more so than on a Tesla just to keep heat from building up.
If it's cold out you can get away with it, if it is hot out you won't. So my thought is keep the Leaf charging rate below 1.5C when it is cold out and below 1C when it is hot out.