Hi Patrick,
We recently re-added the button element to allowed tags within our text card, so you should be able to achieve a dropdown menu using the Bootstrap classes from their documentation: http://getbootstrap.com/components/#btn-dropdowns
However, I am not sure this will solve your use-case, since in order to use dropdown menus for selections, I think you'd need to know those values and we are not supporting external or inlined Javascript in 2.0. This was because we were seeing too many conflicts between custom scripts and our own Javascript, and these conflicts frequently broke functionality we had built.