QAbstractSpinBox: mouse wheel events with control held step by ten, but the up/down buttons and keys do not.

My project requires that the user can press shift whilst interacting with a QSpinBox or QDoubleSpinBox and the step rate is multiplied by ten. This should affect mouse wheel events; Qt::Key_Up and Qt::Key_Down events; and clicking the spin box buttons.

Similar functionality already exists: mouse wheel events with control held step by ten. However, I consider it a bug that this modifier is not consistently applied to other interactions.