I've never heard of it being a customory activity for a Polish university. I mean, to find employment for the academic staff's spouses. Nope.
Thanks, KasiaG. Here in Canada it's common for universities to offer what's called "spousal hire" as well, usually in some capacity within the university. I think I'll still try to pitch that to the institution that's offering me the job and see what happens. I just think it would be hard to convince my wife to go without a job; the main problem of course is that she doesn't speak a work of Polish.