Good questions. Unfortunately, FFP is still new in terms of the development of its software.
1) What you found, by right-clicking your desired seat, is the only way to move yourself. And you have to do it again every time you change tables. There is not a preferred seating option.
2) Not available. You can change your Hand History options in the upper right corner, when you are seated, such as the local folder on your PC, how many days to keep history, etc., but as far as I know, you are not able to see mucked cards post-showdown.
3) If you received a prize during a FR, it should be immediately credited to your account, even if you are a non-deposit player. However, you will have to deposit and provide verification documents before you are able to withdraw.