Hi,
I'm new with Limesurvey and I have a bunch of n00b questions

First of all, I'm not using Limesurvey as a survey manager, I'm using it to build a registration form to small event for a friend.
So far, I've setup the latest Limesurvey and my first tests are running fine, I already reach 60% of my goal in a few minutes !
Now, I want to improve my survey and I would like to know if I can do it with Limesurvey :
#1 : I want to store data from 2 different fields to a same column in the database *OR* I want to change the question in function of the previous answer (only the question text), is it possible ?
I tried "replacement field" but I can't select my previous question in the list.
I also tried "conditions" but it will create another question and store the result to another database field
#2 : date field : I want the user enter his birthday, I add a "time/date" type, but I only want to see the date in the database, not the time, i tried to "Date/Time format" to dd/mm/yyyy without success. I also wanted to set a maximum and minimum date "01/01/1990" and "01/01/2010" : didn't worked, Limesurvey understood those dates as year 3074 or so...
#3 : I want to send a confirmation email to the user and ask him to print his survey summary. Can I join a PDF to the confirmation email or, at least, a direct link to the PDF ?
For the moment, I can only ask to click on the "print" button and the survey end.
Can I improve the PDF layout ? Add a logo, remove the survey ID and so on ?
#4 : confirmation email are sent to who ? If I don't ask to the user email, Limesurvey will never guess it, should I add a question with a specific name to setup confirmation email ?
Thanks by advance for all your advices, links, forum topics, examples, etc !