I've found that when encountering Latin words and phrases that are used in English texts, I will try to look up the Latin by keylinking. Often, though, the Latin word or phrase (e.g., "sui generis" or "exempli gratia") is not to be found in the Latin resource targets, but it is found in English resources like the Concise OED or the M-W Coll. Dict.
It would be nice if we could keylink Latin to an English dictionary. I'm not sure if this would be needed for other languages. Perhaps the English dictionaries can be set up as Latin targets too?