I started using Rails 2 last April but stopped this June because I thought learning it when Rails 3 was released would be more practical since a lot of it was completely refacto
Since Rails 3.2 you can define a .railsrc file with custom command line options that will always apply to rails new
So, if you create a file called .railsrc
and put it in your home directory w/ the contents like this -d mysql
it wll make mysql be your default database. You can put any of the command line options in there (including application templates which are supper awesome!)
Run rails new --help
from the command line to see all your options.