@Blackheart Of course I'm not saying they're wrong, in fact I'm trying to learn what I could do differently to be better by understanding the methods they use to solve problems. For my way of playing (which obviously is not optimal), these mods solve more problems than they cause.
I had completely forgotten that there's a closest mex hotkey. I don't use closest engineer either, I just double click all and then manually select the one closest to what I need. I think I need to try using those keys.
A related thing that I would love to learn about but I've found too overwhelming is the vast number of additional hotkeys that are available under F1. If you or anyone else would be willing to make some kind of guide to that that's easy to follow and understand (particularly including reasoning behind choices) that would be very gratefully received. Particularly the hotbuild stuff: at the moment I click for everything I want to build, and when I've looked at the hotbuild options it both removes some of the keys I'm used to and fries my brain because I can't follow the logic of it.