How long can we delay this update, before the next stable release update will show the light?

Yes it did, and it couldnt possibly have tabs … it was a single text file.

But I accept you want to include the options you set in the graphical interface and not that config file you showed.

Then I think you should revisit that config file you had.

At least thats what I think would make sense to try if you must use synaptics.

In case the original scenario was somehow unclear I will quote a KDE dev on the subject:

(no you will not be able to wait long enough to get that GUI for synaptics back)

If you have the package installed. And its not automatically being used.
Then make sure to use a configuration file like:
/etc/X11/xorg.conf.d/99-synaptics.conf

Section "InputClass"
    Identifier "touchpad"
    Driver "synaptics"
    MatchIsTouchpad "on"
        Option "TapButton1" "1"
        Option "TapButton2" "3"
        Option "TapButton3" "2"
        Option "VertEdgeScroll" "on"
        Option "VertTwoFingerScroll" "on"
        Option "HorizEdgeScroll" "on"
        Option "HorizTwoFingerScroll" "on"
        Option "CircularScrolling" "on"
        Option "CircScrollTrigger" "2"
        Option "EmulateTwoFingerMinZ" "40"
        Option "EmulateTwoFingerMinW" "8"
        Option "CoastingSpeed" "0"
        Option "FingerLow" "30"
        Option "FingerHigh" "50"
        Option "MaxTapTime" "125"
EndSection

https://wiki.archlinux.org/title/Touchpad_Synaptics

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