It would be nice if a choice set could be rendered as a radio button set instead of a drop-down menu. Choices are often taken from a small, fixed, set of alternatives, and displaying a radio button set presents all the alternatives without the user needing touch the page in that usual use case. A drop-down hides all but one choice by design.

The input step interface could be extended by adding a choice() attribute like presentation: or whatever prior art there might be for presentation/control selection in this Jenkins plugin.