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My understanding of what happens when using separate drives is that one drive is given priority in the BIOS/UEFI menu and then people just use the device menu when using the secondary drive. Windows really only cares about its own drive with this setup, so the bootloader on the other drive is safe. I’ve never actually done this myself since the only system I dual boot on is my laptop and it only has one drive installed. To answer your second question, I just use my bootloader (GRUB in my case) to select which OS I boot into.
I think it’s really impressive what the community has done with Super Smash Bros. Brawl. Project+ is basically the current “flagship” modpack. It builds on Legacy TE (which is built off Project M), so there’s loads of new content and more Melee-like gameplay.
Another Brawl mod I like is Brawl -. Its main thing is that it balances the game by making everyone’s movesets overpowered.
Changing genre completely, I really like the Gay Awakening and Gay Fates mods for Fire Emblem: Awakening and Fire Emblem: Fates. The main thing the mods do is add new romantic and platonic supports to the game. The focus is, as the name implies, on adding gay and lesbian content, but it also adds straight content to a lesser degree (like for the characters that can only support with Robin or Corrin).