A Checkbox control instead of using a slider or a drop down list for Yes/No
I thought about adding a checkbox when I added the “File” widget, but given that there is currently no way to have more than one control on a line, it does not really add much benefit compared to a “Choice” (drop down menu) widget.
I would suggest NOT using a slider for Yes/No choices - that was done in some very early plug-ins before the Choice widget was available.