I understand what you mean and agree with you that uMake can be unpredictable and very sloppy. I was merely using the uMake example to point out at the view icons. I like that they are directly accessible without having to click on something else first. There is also an option to hide the icône when not needed.
For the vertical lines I was wondering if having a "endpoint snap" option would make it possible to connect the two planes with lines as shown in my drawing. the snap restriction (end to end) will eliminate the problem seen in uMake. This is just a speculation on my part because I do not have the knowledge you have about 3D modeling programs and its challenges. In a sense I am just wondering if such feature is reasonably achievable.
Thank you for your time and dedication,