Piloting, Stealth and Rhetoric are vastly more necessary than I expected. (And so are the Engineering skills but I scrape by, taking only just what I need)
I still fall back on using Interaction/Emotion a lot, but I'm liking high Rhetoric more than high Etiquette, and I did not expect to get so much mileage out of Menace. Not necessary, but incredibly fun, and very useful.
Most non-Stealth physical skills that aren't Condition or Body Control I only bother with if I'm angling to succeed a specific personal quest. which so far I haven't really done. I haven't done an Arts run either but it should be right up my alley.