Lubuntu default shortcuts to split window horizontally to half, putting current window on left/right/top/bottom:
Super + $\leftarrow$; Super + $\rightarrow$; Super + $\uparrow$; Super + $\downarrow$;
To change it manually by updating openbox configuration file ~/.config/openbox/lubuntu-rc.xml; see how.
synclient VertScrollDelta=-100
If you could revise
the fundmental principles of
computer system design
to improve security...
... what would you change?