How to add Diesel as fuel type into aircraft profile ?

I am flying DA40 D, which can be fueled with either Jet-A or Diesel fuel. I can set in aircraft profile Jet-A as fuel, but not Diesel.

Basically I have 2 challenges with W&B:

1. Diesel is heavier than Jet-A and calculation is incorrect if I use Jet-A in profile and fuel aircraft with Diesel ( Diesel - 0.83kg/ltr; Jet-A - 0.80kg/ltr.)

2. As per AFM I need to calculate fuel weight on basis of 0.84kg/ltr. None of fuel types gives me that proportion.

Can you take into next SD version 2 changes for aircraft profiles:

- option to add new custom fuel type

- option to set weight per unit for custom fuel type (in e.g. kg/ltr)

Thanks

Rainer