[TYPO3-english] extending livesearch in BE

[Peter Jaraczewski]

Hi all,

is there a possibility to extend/override the functionality of 
livesearch in BE? In a project of mine there are some fe_users which 
usernames contain only integer values f.e. 106000 (which is a 
corresponding customer number). Livesearch performs a search only on uid 
and pid fields and on fields which TCA eval contains int.

My first try was to extend the eval with int by putting the following 
line into extTables.php:

$GLOBALS['TCA']['fe_users']['columns']['username']['config']['eval'] = 
'nospace,uniqueInPid,required ,int';

livesearch works as expected then, but this makes it impossible to have 
usernames with strings as well :-/
So, how can i extend/subclass the livesearch to keep my project updateable?

Regards

Peter