config items versus constants, seeking clarification.

[eluser]nuwanda[/eluser]
I'm wondering how others are using config items versus constants.

I understand that configs can be altered dynamically. This essentially means the config set in the config file is a default value and can then be altered temporarily for the duration of the script.

Makes sense.

Are there any other reasons to use config items over constants?

I tend to use constants as they are retrieved with less typing and they stand out more.