In your case there is 1 MPP and 1 DC voltage, but we need to deal with a variation of inverter with 1,2,3,.... MPP's.
And if we make it possible to post them to PVoutput, PVoutput can not handle these values.
Another problem is;
A lot of people that have a >1 MPP's, have different panel counts on there MPP's.
In my case i have 2 MPP's; 1 with 10 panels and 1 with 8 panels both with different voltages on the strings.
Which voltage do i need/want to post to PVoutput?
This case has a lot of issues in it, but where going to look at it!
We let you no what we are going to do :)