Rich HTML editors are available on QB in many places, like Custom Header editor (in Administration pane) and Build/Configuration description. I'd like to request enabling Rich HTML editor for prompted variables.
Sometimes we need prompted variable to be valid HTML text, to use it later on e.g. as Build description. With optional rich HTML editor we could make it much easier for users to prepare pretty HTML, or preview it to make sure everything looks good. On the implementation side, I'll see it as a drop-down field (named "Input box"?) with choices: Single line (default), Multi line and HTML editor. If Multi line was chosen, field Lines (already available) should be prompted. Otherwise, field Lines should have default value (1 for Single line, ?? for HTML editor).