It CAN (though not as a rule) imply a personality type (or just apathy on the part of the individual): http://www.google.com/search?sourceid=chrome&ie=UTF-8...

http://www.ecs.csus.edu/career/articles/article58.html

How interesting. I do have a limp handshake, because I feel too strong of a handshake can be off putting. I don't tend to like people with strong handshakes, because it feels like they're too controlling.