A performance calculator for commercial aircrafts like the Boeings, Airbusses, Embraers, CRJ’s Mc Donnell Douglas etc. to make the navigraph charts app an efb kinda app so we can use it for multiple purposes. And a scratchpad is also nice in my opinion.
I think a scratch pad is in the works.
But I think any form of performance calculation is far from Navigraphs scope or capabilities. As that’s usually made by the aircrafts developers.