Yes, that and any number of minor concessions would have done it. Just a signal that he'd throw a bone. That's how you build coalitions.
Its not only Ron Paul, Romneys’ people tossed no one a bone.
Nothing to the Newt people, nothing to the Santorum people, nothing to the Bachmann or Cain people, nothing to the Perry supporters, etc.
All Romney had to do get the paul people on board was repudiate the NDAA, say he was for full audit of the Fed, F Bernake, and maybe say RP would get a position in his Admn.
For a few million votes that is all he would have to have done.
Think about it.