I thought I'd have a play around with the ini files to try and get my head round the syntax and have come up with the following, targetting the PHPBookmark platform:http://pastebin.com/ZQR0p3xw
I think its nearly there, but there are a few points that I'm not sure of.
1) how the captcha is extracted, looks like some sort of regex but Im not sure - checkcode=%captcha% src="data:;"
2) how the resulting password is extracted from the email
3) the whole verification system, I just commented it out
I will be looking at it again when Ive got time, but if anyone else wants to take a look feel free. There are plenty of targets out there, and it seems a pretty simple platform.