Making a custom p01-contact form

[yojoe]

! sign means that data inside input field is important, so the field needs to be filled.

ad1. you can have multiple contact forms, although I wouldn't use captcha.
There's also math captcha available in p01 contact plugin, and imo it's a better solution than letter captcha.
Personally I don't use any sort of captcha solution. P01 works fine without it, as it's protected pretty well from spamcrawlers.

ad2. you'd need to create a javascript function, and check what value has been chosen from select list, and then fill another input with proper value. Jquery or even javascript snippets may be easily found.
You can look at this fiddle to have at least something to begin with: http://jsfiddle.net/WLacb/10/