Again, you can't say that the hole should be there only if crossfeed is wanted.
Oh, absolutely. What I mean is, crossfeed (or bass boost) is not too important for me, but if the reference design/face plate comes with it, I'd be happy to add it, if only to fill up the holes. In summary:
"I don't think you can go wrong with this amp. ask anyone, and they will probably say 'I love it except for one little thing...' and that little thing will...