Add an option to group/split parameters' values in PB.

I want to provide default values that user might want to change but if they're the same value, they will automatically get grouped into a single parameter.

Eg.
param 1: "Number of wagons", value: 4
param 2: "Number of chests per wagon", value ...

What did you do?
Walking next to multiple miners.
What happened?
I can hear distorted sound like its getting clipped.
What did you expect to happen instead?
Not hear distorted sound.
Does it happen always, once, or sometimes?
Always.

Every time I walk next to miners, I hear some sort of a ...