Ok, I've thought it over, and here's my big problem with the whole "engagement of the week" premise, and why they have to find a way to leave it definitively behind: Nobody would pay the kind of money these people are paying for the kind of services the dollhouse provides them.
In some cases, it makes a modicum of sense ("We need a master thief with a particular skill set for this heist!"), but in other cases (midwife, really?) it's just stupid. Not to mention highly illegal, putting you at risk of years of jail time, and for what? So that your kid can have a surrogate mommy?
Either they need to rethink what it is that someone would reasonably hire the dollhouse for, or they need to dump the engagements as a plot point. At their best, they serve as a way to spin out the premise in interesting new directions, but mostly they come across as just dumb.