If you really like the Dynamic settings, it's okay to stay that way. Most of the store's display units run full time on Dynamic and there are very few issues with regards to picture quality and longevity.
It's way too much color saturation for my personal taste, but there are a lot of people who really like that look. It shouldn't damage your panel at all.
I just got the 52A630 and had a question on the settings. Is it ok to leave it in Dynamic setting mode? I've tried other settings from different people but none seem to pop like the Dynamic mode. Another poster said it was not good for the panel to be in this mode all the time. Is this true?