To use this plugin after installing the gem, somewhere in your Merb config, add:
require 'scaffolding_extensions'
Then you can use scaffold, scaffold_habtm, or scaffold_all_models in your controllers:
class Admin < Merb::Controller scaffold Model1 scaffold_habtm Model1, :things scaffold_all_models :only=>[Model1, Model2, Model3] end
Merb isn't fully supported in that if you override a scaffolded form but don't add your own layout, it won't use the scaffolded layout. Also, using your own layout and overriding the scaffolded forms is untested, though it should work.