The signature would be :

public String getXWikiPreference(String prefname, String fallback_param, 
String default_value);

The underlaying method already exists in the non API XWiki.java (was 
added for http://jira.xwiki.org/jira/browse/XWIKI-2569).

What this method exactly do is : "Obtain a preference value for the 
wiki, looking up first in the XWiki.XWikiPreferences document, then 
fallbacking on a config parameter when the first lookup gives an empty 
string, then returning the default value if the config parameter 
returned itself an empty string."

My +1:

+1

Jerome.

PS: I've created a JIRA for it: http://jira.xwiki.org/jira/browse/XWIKI-3086
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