Hello. =)

I had few problems upgrading, but there are three things I'd really like to fix:

1) When I turned on CAPTCHA support, I got this error message: Email already setup as system email

I want to use the same email address for "Default System Email" and "System Admin Email Address"; I'm assuming I can't do this anymore, and that's why I'm getting an error message. But I could do this just fine in the previous version. Is there a way to fix it? I don't want to use two different emails. =(

2) Speaking of CAPTCHA, is there a way to edit the code? I'd like to just use numbers (no letters AT ALL), and I want to use a 6-digit code instead of 5 digits. I tried looking at include/class.captcha.php, but I got confused. :

3) How do I purge my system logs manually? I know they'll automatically erase within 1-12 months, but...I've been testing out stuff (and got several error messages), so I'd like to purge them before my site goes live.

If anyone can help, I'd greatly appreciate it! Thanks in advance!! =)