I totally agree, it would be very useful to be able to create segments
based on criteria present in the entry hit of a visit. For example, we'd
like to create segments based on the user's login state on entry, e.g.
'Visits where the user entered the site in a logged in state', and the
best way I think to do this would be to use a visit container, then nest
in an 'entry' container (which doesn't currently exist), then add our
custom evar to track visitor login state.