Okay, I've made this modifications for my installation of data plugin:
helper.php
find
case 'url':
$outs[] = '<a href="'.hsc($val).'" class="urlextern" title="'.hsc($val).'">'.hsc($val).'</a>';
modify as this:
case 'url':
list($url,$title) = explode('|',$val,2);
$outs[] = '<a href="'.hsc($url).'" class="urlextern" title="'.hsc($title).'">'.hsc($title).'</a>';
Voila! :) Now you can write url field with titles, like this:
very-best-link_url = http://test.com|This is Very Best Site
p.s. Seems it works with multiple urls also :) Thank you Andi very much for such a clean and good php code - because the noob like me can modify it and can do some results :)