New potatoes in pressure cooker with salt: how to optimize water amount and cooking time?
The only time I've ever heard of something similar is Salt Potatoes

www.nytimes.com/2008/08/22/travel/escapes/22rNYfood.html

allrecipes.com/recipe/syracuse-salt-potatoes/

en.wikipedia.org/wiki/Salt_potatoes

but I've never seen them done in a pressure cooker. However, most pressure cooking charts (http://fastcooking.ca/pressure_cookers/cooking_times_pressure_cooker.php for example) list the cooking time of whole new potatoes at about 5-8 minutes. If it was me I would try one of the salt potato recipes and just cook them for less time.