In Gradient tool:
* Moving gradient handles by arrow keys is restored (it was broken for some time)
* Press Ctrl+A to select all stops in the selected objects.
* When two or more adjacent stops are selected, pressing Ins adds stops in the middles of all selected stop intervals.
* Intermediate stops can be mousedragged along their gradient line, within the limits of the adjacent unselected stops (or end handles).
* Dragging with Ctrl moves the selected stops snapping them to 1/10 fractions of the available range. * Dragging with Alt moves the selected stops depending on how close each one is to the stop being dragged, using a smooth bell-like curve similar to the node sculpting feature in Node tool. This makes it easy to approximate different gradient profiles; for example, if you have a two-stop gradient that you want to shape according to a curved profile, select both ends of the gradient, press Ins a few times to add a number of intermediate nodes, then Alt+drag a node in the middle to smoothly profile the gradient.
* Pressing Ctrl+L with some intermediate stops selected attempts to simplify the selected portion of the gradient, removing those stops that can be removed without too much change in the way the gradient looks. In particular, new stops created by double-clicking or pressing Ins initially do not change the appearance of the gradient, so if you press Ctrl+L, all redundant stops that weren't moved or repainted since creation will be deleted.