Since you'll have to work with haikuporter and recipes, you'll have to have successfully worked on a welcome task "INSTALL HAIKUPORTER AND THE HAIKUPORTS RECIPE DATABASE" or any other recipe creating task.

Create a new patchset with haikuporter for Abe to write all its settings, highscores etc. in B_USER_SETTINGS_DIRECTORY. 

Create a pull-request for the haikuports repo with your changes.