Daz loader. All anyone ever needs. I've slic modded my share of BIOSes too, but ever since EFI it's just less hassle to use the loader, and it works 100% of the time.
Daz Loader is good, but it does not support UEFI installations, because of the GPT partition format.
What comes to OEM installations, with some trickery there is also a possibility to feed the BIOS SLIC key to Windows Software Licensing Management Tool. This allows to install without an OEM-specific installation media, and it's also legal as you're using the legitimate key from the sticker.
For instance Chrome and Internet Explorer are both proprietary applications. And before you get on me about Chrome not being proprietary I wouldn't consider any program which includes non-free bits free software.
Who cares? Even Firefox is developed by a tight group of developers who can pour anything in the absolutely massive codebase. I don't think there is any practical difference between free and non-free. That something is proprietary does not automatically mean that the makers want to screw you. I don't know why that attitude is so widespread in Slashdot. Both parties, free and non-free, strive to create a product that works for the users.
It will help prevent your game from having a generic feel.
It's interesting that you point that out. I have also noticed that I can put my finger on some games and know that they have been made with Unity. For example, The Long Dark or Shelter. Great games but there's the certain "Unity feel" in them. I'm not completely sure what makes it.
A morsel of genuine history is a thing so rare as to be always valuable. -- Thomas Jefferson