This is not as much an issue as just formally asking for the go ahead to add some integration features.

I am in development of a Sonic Screwdriver mod for fabric and would like to add the ability to shutdown or reboot computers with it. Just for the sake of accuracy, as well as setting a precedent for future fabric tech mods.

Again nothing needs to be done here, I believe it can all be handled by the screwdriver.

Sure, feel free to do whatever! There's not much exposed by the API here, so you'll probably have to do some messing around with TileComputerBase and createServerComputer.