For my music server and streaming needs, I'm currently using Volumio 3 on a Raspberry Pi 3 with the official Raspberry Pi touchscreen. Here are some configurations tips I'm employing.

One of the biggest gripes about the Rasperry Pi is the poor out-of-the-box support it has for a power button. However, not a lot of people know that the Raspberry Pi OS does have almost out-of-the-box support for an OFF button. It's enabled using the platform's dtoverlay system.

To create power-off button functionality using the default GPIO 3 as the shutdown signal, it's as simple as adding:

dtoverlay=gpio-shutdown

to /boot/userconfig.txt. Then wire up a momentary switch from GPIO 3 to GND. After a reboot, pushing the button should turn off the RPi.

If you add this to /boot/config.txt as many folks suggest, it'll still work until a system update rewrites that file. Adding it to /boot/userconfig.txt circumvents that problem.

However, you can't do this with the official touchscreen (and likely others), because the touchscreen uses GPIO 3. Instead, you need to specify a different GPIO pin. I chose GPIO 5 because there's a GND pin right next to it on the GPIO header.

dtoverlay=gpio-shutdown,gpio_pin=5

There's a good discussion about gpio-shutdown at stderr.nl.

For a kludgey power-on button, I use a short USB extension cable with a power switch. It's short to reduce the potential for voltage drop. After powering off with the power switch above, one push of the button removes power from the RPi, and another push brings it back, which initiates a boot. It's kludgey as hell, but it works.