[Plugin: Contact Form 7] drop down menus and radio buttons

Hi.

A few questions about the excellent Contact Form plug-in.

1. Is it possible for a user to click a radio button and then have a drop-down menu appear after the button is clicked? This would be an incredibly valuable feature.

2. Is it possible for there to be two levels of choices in a drop-down menu? For instance, if someone was choosing a date for a class, the first option would be Weekends, and then there would be a list under that of different options, and then later down the list it would say Thursdays, and then more options. Both Weekends and Thursdays would not be able to be selected.

Thanks for your help!