An update.  To set the mouse speed, I used...

xinput set-prop "<Your mouse name>" "libinput Accel Speed" 1

Trying to set "libinput Accel Speed Default" will always return

But the maximum speed is 1, it's still slow for scrolling around large

To disable libevent and go back to the old evdev and get the old features back. 
 Move the libinput.conf file somewhere, then relogin...
mv /usr/share/X11/xorg.conf.d/40-libinput.conf /tmp/

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  Mouse acceleration not configurable in Xubuntu 18.04

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