JRoller has upgraded to Roller 1.0.1 and Remember Me is finally working! Since I'm the one who added this feature - please let me know if you find any issues with it. The last time we deployed it to JRoller, it ended up being a huge security hole and you could log into other people's accounts. Doh! Sorry about that. Hopefully it won't happen this time.
If you want to know how this feature is implemented, see AppFuse's Remember Me documentation.