I have imported one big project of mine and it took it without any
problem but the creation of another makefile named "makefile" (mine is
"Makefile")
With luck, make considers first "Makefile" name and then "makefile", but
adding a little check should not be a big challenge.

For importing projects, you can use the "OCaml Empty Makefile Project" project creation wizard. It creates a makefile project without any files inside. Whereas the other kind of makefile project wizard, "OCaml Makefile Project" is meant to be used as a starting point for a new project.

If it should also be possible to use the capital name instead of the
lower case one as default or at least letting the programmer to choose
which name use (only in Windows this is not important)

The name is determined by the "make" command, since it is called to build the project.

Anyway it is a very nice project.

Thank you