Starting an InputScript via drop down list selection: I use the DropDownList command to offer the user a choice of different email texts that is then sent automatically. Ideally I would like to start a different InputScript for each option in the drop down list. Is this possible?

You can start an InputScript with the process= option of the DropDownList command, but not a different one for each option. Since you can query the selected option in your InputScript, this doesn't make much difference in practice.