SUMMARY When you want to open for example 3 or 6(3+3) terminal panes, you have to split 'em twice and get 1/2+1/4+1/4 parts of the screen. It can be useful to have a shortcut to align 'em to ~1/3+1/3+1/3 instead of aligning manually the first one. Owners of ultra-wide displays may especially like such feature It have to be approximate. In my case it 89+90+90 chars with my screen and font size
Just found that if I split through the "yakuake" "split view" then then the terminals are unaligned, and if I split through the "konsolepart" "split view" then the terminals do align automatically. so, the feature is not required. sorry for disturbance.