[TADS3] dobjFor(Default) action()

I've noticed that when I have a Default action on an object and it has 
an action method, that method gets called in addition to the normal 
action method.  Is there an automatic way to make the default action 
override the normal method, or do I have to individually define methods 
for each verb on my object in order to override the normal method?

For example:

horse:
...
  dobjFor(Default) {
    verify() {}
    action() {
      if (gaveMessage) {
        "There is no horse here. ";
      } else {
        "The horse has already galloped away. ";
        gaveMessage = true;
      }
    }
  }

When I try "kiss horse", I get the message I'm expecting, and I also get 
"Kissing the horse has no obvious effect. ".  I can always go and copy 
all the defaults from Thing and null them out, but I was hoping there 
was some built-in way to do this.

Thanks.

      -Roger