For the first point just change the gantry height to what ever number suit you. I do that often when I know the last printed object is the only one to be higher than gantry. Just make sure the other axis will not get in the way otherwise it will smash the printed items and could damage parts depending how well the part is attached to the bed.
For the other part, I wanted to test that out by making some gcode mixer but dont know when I'll look into that. The list of things to look into is getting bigger and bigger every week .
By setting the gantry height to 10000 and the head size X min and head size X max to 1000 you could achieve the same affect I think.
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