I have a problem with marvin. I crafted him and told him, he should produce science. But since this is still warptorio, biters will always come. Marvin is also a fighter, so he goes to the biters further and further out of the base. He ends up going further and further AWAY from the base.

I needed to look at him all the time and always pull him back. As soon as I was not looking at him, he went super far and died. With this configuration all the initial materials to craft him is total waste.

There should be an option to lock him in one place or to forbid him to fight.

You need to cage it with stone walls. Works like charm

Until you need to bring him somewhere, then it gets really messy.

Since we are already talking about Marvin:
I usually cage it in with walls but maybe it would be possible to add a button below "Follow you" that stops all of his movement, meaning he stays in the same spot?