I would just like to again say that there is no good reason for a user keynote to require a host. It in fact wastes a lot of time and I for one am plenty tired of it. What if you want to keynote something that doesn't function as a host? I'm sure you can figure out your only choice.
Also, I personally believe the way Revit wants to find everything a host is a flaw and not a feature.
The way it wants to glue detail or model lines together? Same thing, a flaw and not a feature.
Certainly there are a lot of elements that require and benefit from using a host but everything should not be geared to find and use a host it wastes a lot of time.
