Just get the member to tick the "Remember Me" box. It's hardly takes a huge amount of effort and they click the "Login" button right next to it every time they login. Also sometimes the user might not want to save their login like if they are using a shared computer or something of the sort.
We are dealing with a special type of users on this board, and they are people who need to be spoon feed every detail, and I am 100% sure no one will be access this particular board from a shared or public PC.