Ask five people get five opinions, ask ten people get ten opinions. Get what I'm saying here. But most importantly ~ there is no such thing as a "direct short sale lender." Use your own bank or credit union (checking, savings, CD's, Etc.) as they know you...and you know them -- it's that simple!
Best of luck, Be Safe and have a great day.
You should only use a lender you want to use, however it's not a bad idea to also cross qualify with the short selling lender OR just another direct lender (i.e. BofA, Chase, Wells Fargo). So long as you also supply a statement showing proof of your funds for down payment, closing costs you'll be fine.
The extra special thing you should do, once you know that your offer has been accepted by the owner of record (mr. seller) and that ONLY your offer is being submitted to the short selling bank is to order your OWN appraisal & get it ordered from one of the direct lenders,,,turn in that appraisal to the listing agent to submit to the bank. If the short selling lender is a major bank, cross qualify with that bank & get your appraisal ordered by them.
This will help you out a lot & the short selling lender will probably bypass ordering their own valuations. Don't forget to have your agent show up when the appraiser goes over to the house to present your case for value.
The advantages can be significant...but be sure and compare with other options to make sure. If they are a reputable company, they might offer extra closing costs, or free appraisals....lower interest rates for fewer/no points. Definately look into it!
Good luck with your home purchase....Congratulations!