Windows NT, something i remember from being half a child still, not that i have grown more mature since then, i probably got dumber by each decade, now i am working on a mac, a system which has become increasingly impossible to customise something which i appreciated this system so much for in the beginning. i have a humongous list of terminal hacks to make natural things like turning off the wait staits of the keyboard etc. possible. but apple is deciding each year to close more and more windows either purposely or just blatantly ignorant. in that matter i salute the customisability and the individuality. ps: never found a way to customise the mouse without having to install an app which then keeps running in the background 
regarding that split, if this is something you need and use very often, macros are often used for extactly that. one could utter a wish to implement this into the commands which could benefit from such an option. regarding your curved surfaces, that might be less easy have you got an example for such?