“If I didn't define myself for myself, I would be crunched into other people's fantasies for me and eaten alive.” --Audre Lorde
Doing overhead press on a squat half rack is ok.
I'm pretty pissy when it comes to unnecessarily doing things in the rack, but shoulder presses are fine by me.
When I do squats and OH press in the same day, I just check to make sure that nobody is waiting for a rack, as a courtesy. If someone is, I'll do something in between and then come back to the rack.
I've always preferred the overhead press with dumbbells, myself.
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The press should be done with an olympic barbell in the squat rack - you shouldn't have to clean the weight before the first lift, you should just lift it from shoulder height out of the rack. Squat-rack-hogger scorn is reserved for biceps curls, posing, -- and yeah, those are the same guys anyhow. I think half the exercises done with free weights in a typical gym are curls. Weird when you think about it.
Also people who use squat racks for their metcons annoy me because you never know when they're done and if you are doing a metcon you should be doing dangerously heavy weights anyhow.