There is no way to do that, mostly because that breaks the benefits of wrapping the rows of data into self-aware objects.
The simplest solution would be to:
$data = fORMDatabase::retrieve()->query("SELECT * FROM categorii");
This code would also be faster. If you need it to go through all of the processing with fActiveRecord, you could write a class like the following, and have your records extend it instead of fActiveRecord:
class TransparentRecord extends fActiveRecord {
function pullValues() {
return $this->values;
}
}
class Categorii extends TransparentRecord { }
fCore::expose($categorii->call('pullData'));