You are right, Sims cannot gain skills on community lots. They can only gain skills in community lots on University campuses if they are young adults. There is a hack here: http://www.moreawesomethanyou.com/smf/in… to enable community lot skilling. If you want it, click on the link for the most recently released expansion you have, then hacks, then scroll to comm-skilling.zip. This is what it does: “Controlled sims, NPCs, and townies may gain skills while visiting community lots, including non-college community lots. Notifications of skill-point gain will only be displayed for controllable sims.
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