Ill have to see about the Jhead hotend. If I don’t like it on the gmax it will probably be swapped to another printer.
Once you change those settings once it never has to be changed again.
Green lines usually mean they aren’t fully constrained. For stuff like this it doesn’t really matter, but with more complex things it makes a big difference when dimensions are changed. If you were to go back into that file and try to change one dimension, a lot of things might move in random directions to make it easier for that dimension to change. For something this simple it would probably move how you expect, but when you get into complicated designs, especially when features are defined from other sketches, things start to move in really strange ways when the lines are green instead of purple.