A "normal" node has two or more places you can click:
The body - which lets you drag to move the node.
The port[s] - which lets you drag to draw a wire.
But a junction only has one place to click, so currently you have to use shift or ctrl click for one operation or the other.
Is it possible for the junction to have both body and ports, but they would only be visible on mouse over or if the junction is selected?
We do already have differing appearances for some nodes selected/not selected, the link in and out for example.
Appearance when selected could be two dots as Simon suggests, but I like the idea of an inner and outer circle. cf a junction station on the London tube map.