Hi,
I cannot say for sure for the 787 but I have flown both the 737 series and the A320’s.
The nose wheel is linked to give a limited input from the rudder pedals. usually close to 5 degrees. Although this is not true for all aircraft, for example I flew the twin-otter witch had the pedals and hydraulic nose wheel steering completely separated.
Here’s an excerpt from my study notes on the A320:
To answer your question, on the A320 the nose wheel steering is either done with pedals or the tiller, or both.
on a straight line it’s recommended to taxi using the pedals, full deflection will give you 6 degrees of nose wheel steering angle.
in turns you have to use the tiller, full deflection will give you up to the maximum of 75 degrees nose wheel steering angle.
Since NWS is Fly-By Wire, the numbers add up so if you use full pedal, you can ‘add a little’ with the tiller. also if the captain turns full left and the FO turns full right, the aircraft will go straight ahead.
To complete the story, the tiller is not linear, which means if you add a little tiller the effect is minimal, but grows exponentially with deflection, so be careful, because the last little bit of tiller has a huge effect and can easily skid the nosewheel or floor your lovely cabin crew.
During take-off the wash-out is not equal for the tiller and the pedals,
the tiller has full authority until 20 knots, and then reduces linearly until at 80 knots it’s completely disabled.
the rudder pedals have full NWS authority until 40 knots and then wash out fully at 130 knots.
so a few examples:
below 20 knots you have full authority, but even with both tillers and the pedals to one side you get maximum 75 degrees nose wheel deflection.
at 60 knots, your pedals can give you about 4 degrees of steering and your hand wheel about 25 degrees.
above 130 knots the nose wheel is centered no matter the input.
I hope that helps!
Rico