My advice would be to secure it for a few more years. Your keywordrichdomain is going to scream 'spam' at Google, thus making it tough to get it ranked, but one way to lessen that is to secure the domain name for 3 years. Most spammers running thin sites or phishing sites usually use throwaway URL's with a one-year registration.

Yes, Google does look at signals like this, so keep in mind that they see a domain owner with multi-year reg as someone who is operating a 'legit business'.

Is WA still telling people to register keyword-rich domains? If so, they shouldn't be.

Regardless, it's a pretty nice grab, provided you can build a great site! Best of luck!