I know a few people who swear by MTB skills for their cross and road bike when it comes to smooth riding over rough(er) terrain and/or obstacles. Certainly couldn't hurt. I know the number one skill for me on the MTB when it comes to funky terrain is getting off the saddle. That way the bike can wobble and go all over and I won't lose control.

I'd be interested in hearing how it all works out for you in the long run. I'd love to have a cross bike at some point.