In my experience touchpad works better in Budgie than in Gnome or Xfce. You can even click middle button by touchpad using three finger tapping. My touchpad has some issues with the other DEs. But I have one more issue: The left buttons of my touchpad are broken and I don’t blame Budgie. But could I setup a modifier key, say Ctrl, so that when I press it and simultaneously move mouse cursor, it will act as if I had left button pressed while moving the mouse cursor. That way I could drag e.g. a window or paint some area by my broken touchpad.
hi @jarnos!
Just a silly question, for what it’s worth: have you tried blowing on the edges of the touchpad to remove any dust or cookie crumbs? 
If that doesn’t restore the left button, you should try this method:
xdotool is for xwayland apps. Don’t think it will work for wayland apps.
ydotool is the equivalent but I don’t have any experience setting that up.
You could modify you rc.xml to enable tap and drag. Slightly different gesture.
So double tap but on second tap immediately move on the touchpad to drag. Lift off to end dragging.
<libinput>
<device>
<tapAndDrag>yes</tapAndDrag>
</device>
</libinput>
That feature is already enabled in ~/.config/budgie-desktop/labwc/rc.xml, probably by default, but I was not aware of it. But thanks for the hint. Luckily I am able to combine Super key with the gesture to be able to drag from other part than the title bar, too.
… getting old … forgot what I actually implemented !!!