At the moment junction boxes can be drawn when they are being created. After the junction box is saved, the form of the boxes can't be adjusted anymore.

This is problematic because:
a) Now it is possible to move nodes inside a junction box. But if the junction box is too small, there is not enough space to sufficiently correct and move a node.

b) If the junction box is not sufficient it must be deleted and recreated in order to correct some bad edits. This leads to a loss of all saved cross-times, which affects routing for a period of time.