Is this for all DCSR loans or can these items vary?

Depending on what your goals are.

Does the market really want nearly uniform full-service brokerage service (often of varying quality)?

I have sold a couple of homes in Wayside village by Rausch Coleman and the monthly rent price depends on so many factors so I can't answer you a Yes or No.All the best. 

Depends on your investing style of course but I do not believe there is a better turn-key company in the US for those that want to be as hands off as possible.  

You may consider terminating the lease depending on how much time remains, your skills, the legal system, and other factors.Based on what you've said, I am concerned there's someone else occupying the home or something else is going on.

I've included an example below to help illustrate this.So different lenders have different rates (which do vary even for DSCR loans) but these are factors they all consider.See example below:DSCR < 1Principal + Interest = $1,700Taxes = $350, Insurance = $100, Association Dues = $50Total PITIA = $2200Rent = $2000DSCR = Rent/PITIA = 2000/2200 = 0.91Since the DSCR is 0.91, we know the expenses are greater than the income of the property.DSCR >1Principal + Interest = $1,500Taxes = $250, Insurance = $100, Association Dues = $25Total PITIA = $1875 Rent = $2300DSCR = Rent/PITIA = 2300/1875 = 1.23If a purchase, you also generally need reserves / savings to show you have 3-6 month payments of PITIA (principal / interest (mortgage payment), property taxes and insurance and HOA (if applicable).

Depending on your market, you can look up sold properties on Zillow.

But with insurance claims it’s very dependent on the budget of the displaced family’s insurance coverage. 

That’s the key benefit.As for the cost segregation study, whether or not it makes sense really depends on your tax situation.