Merely selecting a node makes non-reversible changes to the node

[ZzZombo]

Just selecting nodes makes some kind of changes that can not be easily undone. Offsets and whatever else are modified and no longer can be restored by clicking the "Default" button. The only way around this is to delete one or more connected segments to recreate the node anew and not to touch it with the mod if changes turn out to be catastrophic. And the other "Node Controller" mod doesn't have this issue so I resorted to using it.