Well, I missed this feature in April 2010 and found some snippets in menu_1024_768.ini (Section G35). I was in contact with Latemail at that time but we both could not find a solution to make it work.
In fact this feature was planned but just partly implemented in SH3.
Maybe h.sie or Stiebler could do something about that.
But you can edit your KaptainsLog:
In the lower right corner you see the button for the edit-box highlighted. If clicked it looks like this:
But this is the point-of-no-return! You can leave it just by killing the sh3.exe in taskmanager - Cancel, OK, ESC do not work!
So you can edit your KaptainsLog with some restrictions:
Start your patrol and save it. Now you find a file named "savename.clg" in your own career folder.
If you open it with an Texteditor like notepad you can find this:
I entered [Log Entry 1] by hand (NOTE: `C0xA10000FF` and `C0x0` are responsible for the red colour).
But you will see your new entries after you reload this saved game.
The question will be if it is worth all this work.
Regards
Blueduck