@customerx, @sublimeartistry, @vanepp
Well, you are right in all cases; You can’t overlap drill holes “it would probably snap the drill bits”. I just use a round hole when possible, but not always possible. I have seen boards with these slots but I don’'t think they were made by a 0.6mm router bit. I believe these slots are laser drilled… most modern pcb machines have laser drills for the very small holes. But there is no way to draw them up in Fz or tell the fab house how to cut them. The tabs really need to be there to help line up the part for the smt solder pads and the part gets a lot of stress.
My suggestion would be, is to drill a hole at each end of the slot and as many holes in-between on the longer slots leaving a space in-between the holes so the holes don’t touch each other. Then take an x-acto knife and cuts the tabs out making it a slot. I believe the copper is just so the housing will be grounded and the solder will take care of that when you solder the tabs in.