>So, does anyone know when will those options arrive (or if they already existed)?
Borderless windowed is a popular feature so I'd expect it to make it in eventually but it doesn't exist currently. In the meantime, people are using this as a workaround.
M&D care a lot about accessibility and the game has been designed so that using the keys isn't even necessary. If your disability makes mousing an issue then I expect M&D would like to hear from you about how they can help you out.
>What is the game's stance on befriending people in a more permanent way outside of the game?
The game itself doesn't provide nor prohibit. M&D are aware that some people will want to make friends while some others enjoy the anonymity. Currently a lot of people have appended their character names to their discord names so that someone who finds them in the game can also find them outside the game.
Just to confirm, borderless windowed mode (the thing that would allow you to avoid having the game minimise) isn't in the game yet. Some people are using this workaround in the meantime.