[Request] for renaming variables

[CR Haeger]

If I understand, it may be related to doing work in CAS with say lower case f(x) then wanting to just copy/paste or use this in Function App.

The app requires upper case Xs and there seems to be non obvious workarounds like:

f(x):=sin(x) // define CAS variable program with lower case x's
Function.F1:=f // defines F1 as f(x) and converts to upper case X when opened in Function app

Now Function app F1 shows sin(X)