I know you said that you didn't want to require setup using the command line, but I believe what you want to do is taken care of by the bootstrap rake task.
I typically set up a bootstrap task that will create all the tables necessary for the application to run on a new server. You can either setup capistrano to run this after updating the code on the remote server, or you can run it yourself on the command line with a simple "rake db:bootstrap:load"