Re-install Gallery to change defaults?

Hi folks,

Gallery is working good, and now that I know how it works and what it’s doing, I want to change some defaults (such as standard available image sizes, default details for each album), but can’t figure out how to do that. I read on the Gallery site that I can run the install program again to change defaults without messing up the existing database…but obviously, I’d like confirmation before I do that…

Anybody? Or any other way to access those defaults?