Konqueror can manage a divided window (as kwrite etc. can also do that). As Konqueror is not only a browser but also a full operable manager of files...
Fortunately, for the rest of the world your attitude doesn't represent the direction that Canonical is moving. I think that there goal is definitely...
lxrandr "Save" hasn't ever worked to my knowledge. I use it to setup presentation modes on my laptop when giving presentations at LUGs around here. ...