Hi, just playing around and accidentally delete my ~/.config ~/.gnome and ~/.gnome2.
All my settings are reset and my touchpad no longer be able to vertical edge scrolling.
Googling with a little light pointing me to do $ man synaptics.
The manual page was like hieroglyph but re-read over and over again earned
me some of knowledge to set some of the synaptics properties.
So here is my ~/.profile, i added 2 lines of the properties at the end of the file
xinput --set-prop "SynPS/2 Synaptics TouchPad" "Synaptics Edge Scrolling" 1 1 0
As the manual says:
Synaptics Edge Scrolling
8 bit (BOOL), 3 values, vertical, horizontal, corner
where the "1 1 0" meaning Vertical "on", Horizontal "on", Corner "off".
Happy scrolling ^^