SCT doesn't have all the tables defined either mind you. There are a good 20k or so adjustable parameters in a Ford calibration, but you wont see any tuning company give them to you. Will you ever need to adjust the duration the ECU waits before it initializes the CAN Bus? How about the distance to travel before an oil change reminder is shown? Probably not
As such they try to prioritize the tables and use cases they will see most often and give you the tables you need to affect the performance of the engine.
The problem is IPW was something they added to their list of parameters after they defined a lot of strategies. So they have to go back, and Eric can only do so much work in a day! They try to get things added as quickly as they can when you request, but again, its a small team. If you don't have IPW and really need it, you can work it out and get pretty close as well.
Airflow / AFR = Fuel Flow
Fuel Flow / No of Injectors = Inj Fuel Flow
With Fuel Pressure (which you can log or in most cases hope to assume reasonably) and required flow, you can figure out the PW (by chart, or via using math like Fords estimated Lo-Hi slope)
Basically you do what the ECU does, but without the ECU doing the math for you
I don't even think IPW is loggable in SCT for comparison.