Hi Tover, I'm glad you are liking MoI!

So the construction lines function is what MoI has for that kind of functionality. And just to make sure - that doesn't just mean drawing additional regular lines, you can create what MoI calls a "construction line" while you are in any drawing command by holding down the mouse and dragging away from the point of interest.

There is more information here:
http://moi3d.com/3.0/docs/moi_command_reference11.htm#constructionlines

Having such lines appear in an automatic way works well for sparse drawings when you are drawing just a few lines like you show there. But when things are denser it becomes frustrating because your working area fills up with snaps all over and it can interfere with freely placing a point. So to avoid that MoI is intentionally designed to not do those automatically, only when you generate a construction line which can be done with a quick gesture inside any drawing command.

- Michael