Derek CORDEIRO wrote:

That does not work for me at all. The following does work with generating
the same ThOMAS

can you try ..

\definefontfeature[smallcaps][smallcaps][liga=no]

\usemodule[simplefonts]

\setmainfont[A Jenson Pro Regular]

\starttext
{\sc Thomas}
\stoptext

if that works, then the font is bugged