Although, I also agree with allowing the user to choose 
I do find it weird that the default behaviour is to “add stuff” instead of replacing (Revit’s default)
We could have a per-stream setting that gets stored along with everything else. But we’d also need some editable connector “default” settings too, so user’s won’t have to change the settings on newly added streams everytime if our default doesn’t work for them.
On a side note:
@hzamani-i2c I think you may have just found a bug here I’ll pop a new thread from your original post to not have multi topic conversations in a single thread 