Yes,
Go to the Model, find your setpoint item, then click “Add metadata” > “Default List Item Widget” and then change the widget type from “Default” to “Stepper List Item” or “Slider List Item”, whichever you prefer.
Complete the details and save.
Better heuristics to determine the best default widget is something that has will have to be improved in subsequent OH3 releases, right now little more than the type (and eventual state/command descriptions) are considered. Surely the semantic tags should be considered as well.