I would like them to show up every now on the in other works. I only read some NF short stories because i do not have the time to read the whole thing and also i like to know how the aliens i am reading about look like.
You could always read or at least look at the comic books
Do you read Titan, or any of the Relaunches? I don't really see where the use of new aliens in NF is any worse than their use in those series. Hell there are a lot more new, and unusual aliens in the first couple Titan books, than in the whole NF series.