Its an extension I’ve made after read the tutorial link you sent
The extension also comes with support for different connections in gii model creator
What i mean was that it would be nice to add something like that in the core
for example, in my extension
the method ‘connectionId’ returns by default ‘db’, and you can overwrite it in your model to use a different one, returning a different database connection component
It only adds default functionalities to the framework’s core
and to add multiple database support for gii you just need to change a couple of lines and will save peoples time