This one doesn't scroll. Some of the later models do though. It will flash one message and then in a few seconds flash the rest of the message though.
Getting them programmed is the problem. You'd think it would be easy but it's not. Many systems pay the manufacturer to do it for them. Large systems have a dedicated department that does it. The software is tightly controlled by the manufacturer. I work in transit, so I was able to get it done with my contacts. I have about 10 different things in mine.