Never used Klonan's Construction drones, so I'll look into that one (for issue 1 & 2).
Your third point, I never tried to place mining ports next to eachother, rather I'd use a larger roboport (there are three tiers available). This also covers your 5th point (2nd request) about mining area settings. If you could increase the mining area in settings, what would be the point of building higher tier roboports? So probably this won't be implemented.
Request 1 and 3 are things I'll dive into, but I'm no real lua-coder, so it might take som time for me to work out how to make this work.