Automated signup

Is it possible to simulate a Mantissa signup with axiomatic?  I'd like
to be able to regenerate the axiom database and test my app without a
lot of tedious clicking around to create a user every time.  Here's
what I've got so far:

    rm -rf app.axiom
    axiomatic -d app.axiom mantissa -p pass
    axiomatic -d app.axiom offering install App
    axiomatic -d app.axiom userbase create user localhost pass
    axiomatic -d app.axiom/files/account/mkp.ca/mike.axiom web
    axiomatic -d app.axiom/files/account/mkp.ca/mike.axiom web-application

When 'user@localhost' logs in, he sees:

    user@localhost  | Settings  | Sign out  | The renderer named 'introspectionWidget' was not found in <xmantissa.webapp.PrivateRootPage object at 0x1a74b90>.

    You have no default root page set, and no navigation plugins installed. I don't know what to do. 

I suspect I "can't get there from here" and will need to write an
axiomatic plugin, but I thought I'd check with the list first in case
I'm missing something.  If its true that custom code will be needed
and the information is handy in someone's mind, a list of the powerups
to install in user@localhost's store would be great.

Thanks!
Mike.