It would be an entity like inserter. You can prgraming it like uC open it upload your code. (Or remotely via radio signals.
)It would have two options.
One is sand box and other one is survivor.
In survivor mod you can turn on and off anything and controling the factory. (P and I and D etc...) And it also can contol drones and blueprints. In this scenarios you can able to make self replicating machine basic A.I. If it can edit own code. Acces to online HTML sites whith curl. It hase endless possibilitys.
In sandbox mod you able to add items control player movement like a god program and etc...
In nutshell like Wiremod Expression 2 just in Factorio.
For example:
https://github.com/wiremod/wire/wiki/Expression-2
