Those proposed changes are actually minimal, they mostly expose world item properties that already exist. The list is sorted with most important changes on top.
All electrical boxes need to be able to revert to their default configuration regarding connected power sources that existed at the new game start. The data exists, it just needs to be copied into each electrical box, so the game would not have to parse through the entire new game template to find it. To do so, all electrical boxes need a "Restore Defaults" button next to the "Unwire" button on the Sources section of their Connections window. This button first disconnects all sources, and then adds all default sources, while checking that those still exist and are not destroyed somehow.
All electrical boxes need the Connections menu made visible. Those that currently do not have one, need that menu item retroactively added with some future patch.
The Connection menu needs another column added to both source and destination tables: a small switch button that can switch the connection on/off without actually destroying it. Some connections are difficult to manipulate because their world objects are hard to reach.
Please, let us craft small flat electrical boxes, like some buildings have. Those boxes should be attachable to the walls, and have both quick on/off menu item, and Connections item in their menu. The purpose is to control groups of power connections, for example to switch on/off some of base's external lights. To prevent the "power creep", the box must be placed within UC's control area.
The Makeshift Battery should have quick on/off button at the top of the menu. It temporarily switches all it's destination connections on/off, while the battery can still recharge from it's power source connections.