You right is much better in this way and the use of custom class allow more control.
I made a query for quickly add my custom class name in all specific field type such Text:
Code:
UPDATE `jos_comprofiler_fields` SET `cssclass` = 'Myclasstxt' WHERE `Type` = 'text'
That work for Text field but not for Single Select drop down type and Textarea. Adding type such 'select' or 'mediumtext' in the query don't work. How to format ?