Marco: there's no need for these to be "slowly" introduced. If the features are worth having in the default REPL, they're worth having as soon as possible, without us artificially slowing the process down. It will be hard enough to get somebody willing and able to do the work without telling them to dribble the features out slowly as well. Trust me on this, the hard part of Python development is getting feature requests implemented *at all*, not that they come too quickly!

You might like to try building these features on top of the pure-Python interactive REPL:

https://docs.python.org/3/library/code.html

or perhaps try adding them to IDLE.

If and when you have something positive to show, you could try re-opening this task with a concrete proof-of-concept using the code module, or perhaps a PR for IDLE.