What exactly are you thinking? Like /etc/alternatives/diff points to /opt/maemo/usr/bin/diffmo (or /usr/bin/diffmo)?
I have also made a "colordiffmo" package which is colordiff using diffmo. I think it made it through the builder, but I haven't checked yet. I may do a coreutils package this week, prefacing all the binaries with "g", which I heard is a convention somewherez.