1. This can be done by
conditions. You have to set the condition for all questions of this group which can be done by copying them.
2. Not sure what you are op to. if you want to change the wording just
edit the language files
3. As far as I know[ this isn't posible. There only exists an
option for the user to print his/her answers. Emailing the esults to the user (to the admin is possible)
has to be coeded.
4. This might be tricky. Please elaborate what you are up to.