Thanks Danny,

The only problem I have with this solution of extending the "scaling rail" past the "end profile" is it is kind of tricky to setup so that it intersects my end profile exactly.

Yep, your probably right, the sweep with scaling rail option is probably not something you would ever need as you would just use network in most instances although the maintain tangency option comes in handy in some circumstances which network doesn't have.

Just had a look at the command reference and in there Michael shows the scaling rail extending past the end profiles.