This can be done using a plugin to update $sFilter in loadSurveyResults

The ->compare system is great too.

One "column",one "value"
http://www.yiiframework.com/doc/api/1.1/CDbCriteria#compare-detail

Compare can use directly (in value) : <= , > etc ... (see in actual browse responses). And =: remove the partialMatch

We just have lack of 'in array' on OR ability: but this one need:

• event->set('criteria',$oCriteria)
• $oCriteria=event->get('criteria')
  or something like that.

A lot more of possibility for plugins ... but a lot of events happen

I have a solution : i update the "export" action link toi use my own export system .....
But if needed : can be included in core.