Well, having a native way of putting a junction-type node into place is an enhancement in it own right (not having to edit the function node to change it to an icon)
A closely coupled junction node would be less visually cluttering (and allow for finer wire routing) than the current icon sized method.
But as you say, a single junction node would be less cluttering again.
If the editing restrictions on a single junction prove to be insurmountable, then maybe a closely-coupled pair will be needed