In the context of Trek: In 'Enterprise' we have seen that in some places of the ship the gravity is first nullified and then reversed.
But since that transition is very noticable it wouldn't be very practical to have the gravity change within the turbolift-shaft in that angled dorsal....
Gravity in the Turbolift-shaft? If you're smart you keep the shaft DEVOID of gravity. That way you don't have to fight gravity with the lift propulsion itself. You also don't have to fear the lift falling down and killing everyone inside (or in the shaft) should something bad happen the lifts propulsion and anchors. You put the gravity IN the lift (cabin) ITSELF. That way it doesn't matter one bit how the lift changes position or angle as it zips about, to the people inside, up remains up, and down remains down. Indeed, it would also help putting any inertial dampers inside the lift, so it can zip around as fast or slow as possible without the people inside being reduced to meat patties.