For some of you, one of the main reasons to jump on iOS 13 right away is mouse support. You can connect any Bluetooth or USB mouse to your iPad, and use it pretty much like you’d use a mouse on the Mac.
You can even use a multi-button mouse. And guess what? You can assign all of those buttons to mouse functions. I’ve been using a mouse with my iPad on and off throughout the beta period. During that time, I’ve come up with a shortlist of the most useful mouse button features in iPadOS 13.