The logic switch is in the game now. You can create a single machine on / off switch using 1 switch and 1 relay.
It is fun using splitters and logic blocks to wire a bunch of machines to a single switch though. Watching everything shut down and turn back on after you've built the circuit is satisfying.
I tried implementing a pause button for the videos but I couldn't find a method of pausing the video, returning to game-play and then resuming where you left off. So I added a fast forward button instead, which should help you get back to where you left off in a video if you want to stop watching it to do something in game, then return to finish the video after. It is possible to pause the video without returning to game-play but that didn't seem very useful.
Some sort of wiki or guide for the game might be a nice addition.
I added 4000 iron blocks to the lunar lander at the beginning of the game, so you have the resources to build flat surfaces for your machines right away. Platforms can be built floating, they are not affected by physics so they don't have to touch the ground. I usually build supports for them for aesthetic reasons though. These blocks also give a bit of an advantage if you're playing with hazards enabled as iron blocks are pretty resistant to meteor strikes and you can build a sort of "canopy" over your machines with them.
I will look more into manual routing for the next update. I am thinking a key-bind that gets a pointer to a machine instance based on what you're looking at, then calls the AttemptOutputConnection function for that machine with a pointer to the next machine you click on as a parameter.
This will probably be the next thing I work on.
[Edit] I have been working on this and realized that it would require extensive re-writing of the network code for multiplayer as machine connections are currently controlled with the range slider and these adjustments are what is updated over the network. Under the hood, the implementation is a lot easier for single player but even then it is quite complex as it is a major change to some core mechanics.