Are you stupid or something?
Using the game list will automatically set games to run optimally for 720p saving you all the hassle of entering any options menus.
How can you honestly believe navigating a full desktop os on a 720p 5" screen is better than just clicking on a game and have it...
That's only going to change the resolution of the picture streamed, Not the actual internal resolution your computer is rendering. Sure it will make your stream smoother, but it won't increase your frame rates.
Yeah it's pretty easy, install the title on a different sd card and it will still appear when using your original card but won't be playable. You should then be able to format the other card and still keep your icons.
Fans shouldn't spin up in hand-held mode (unless ambient temp is high) as the gpu is down clocked, when you attach the charger (depending on the application) the gpu will boost its clocks and start putting out more heat requiring the fan to kick in.
Are you using sx os? I found battery drain was quite heavy using sx os and the sx core, after switching to Atmosphere I tend to get way better battery life and much longer sleep time.
Try leaving your switch on charge over night. I thought I had killed mine after installing a modchip, turns out the switch needs a bit more charge than normal to boot with a modchip. If thers is not enough battery the modchip will blink and the switch will attempt to boot but shut-down straight...