The way I have set up my MX Anywhere 2S Mouse keys is in the following format
Left Click - Tap
Right Click - Open Assistive Touch Menu and I have added APP Switcher to the Menu so I do my APP Switching from there (Multi-Tasking)
3rd Button - iPad Home Screen
4th Button- Volume Up
5th Button- Volume Down.
But I liked the way you have set up your buttons, I am just wondering do I need to block my button on the Mouse for Volume up and down as even the Bluetooth Keyboard that I am using offers volume Controls button. So it is dual functionality that I have, two times.
I could instead use the 3rd Button on my Mouse for Control Center just like you have, to switch to Airplay Speakers which I often use. But even that can be managed by using the Mouse Cursor and bringing the Control Centre down by forcefully pulling it down from the top right corner. So everything has a Substitute.And If I assign my button 3 to Control Centre, I will have to figure out what am I gonna assign my Button 4 for ?