The libinput issues are more or less settled now. I'm providing updated
packages of latest libinput (1.11 pre) with the relevant patches here:
> https://download.opensuse.org/repositories/home:/mwilck:/branches:/X11:/Wayland/openSUSE_Leap_15.0/home:mwilck:branches:X11:Wayland.repo
This should make the stick on the DELL E7470 usable with libinput.