This is more for me since I seem to install it quite regularly.
I've been snagging the SQL from OBIEE query logs (nqquery.log), which doesn't come out too pretty.
So that I don't have to manually format 400 lines of SQL, I created a formatting template. Ctl - F7 and voila!
I do go back in and make small changes, which is why I am writing this. As I scroll down through the file and indent or change code, the GROUP BY clause is auto-generated, which is annoying to me.
To turn it off is easy (if you can remember, which I can't, which is why I write this).
Go to Tools - Preferences then look for Code Editor:
Expand that group and then go to Completion Insight:
Uncheck the box next to the arrow and you're done.
My hope is that in the next version of SQL Developer, we'll be able to call the SQL Beautifuler from the command line. That would be pure awesome.