parts without time (and bars and key)

[Werner]

I want to write without time, with no bars and - with no key-signature (or
C-major), but the behavior should be: every accidental holds only for one note,
so naturals aren't necessary (can be forced like always with ! or ?) but for
repeated fis e.g. it is printed always a sharp.

Is there already a predefined key and time for that or do I have to make
everything manually?

Greetings

Werner