Thread:Project:Support desk/Allowing PUA characters in wikimedia search

Since not all characters used are yet in Unicode, PUA, or private user area, codepoints are often used for such characters, however whilst that default implementation of wikimedia stores PUA characters with no problems, it does not include them in the search. What is the way to adjust the settings so that PUA characters are included? Does this have to be done when the installing or can this be changed after installation?