In case someone need to bypass the confirmation step: Modify the /web/form/app/cls_ps_******.inc.php file like this:

//------------------------------------------------------
// Reg Page2
//------------------------------------------------------
case "reg_page2":

//-- [BEGIN] Validate prev PageID & Set new PageID
if ( !$sc->CheckPrevPageID(
array(
"reg_page1"
)
) ) break;
$sc->SetPageID( "reg_page2" );
//-- [END] Validate prev PageID & Set new PageID
/*
//-- [BEGIN] Load values from State
$def->SetNS( "rs:def:" );
$def->SetList( $this->fs_reg_page2 );
$def->FromState();
//-- [END] Load values from State

//-- [BEGIN] Output
$def->ToZBuffer( XC_OF_DEFAULT );
//-- [END] Output

//-- [BEGIN] Set display on
$this->SetDisplay( "def:", true );
//-- [END] Set display on

//-- [BEGIN] Set template page
$this->SetPage( $sc, "reg_page2" );
//-- [END] Set template page

break;

case 'reg_page2_prev':

//-- [BEGIN] Go
$sc->SetNextSc( "reg_page1" );
//-- [END] Go

break;

case 'reg_page2_next':
*/
//-- [BEGIN] Go
$sc->SetNextSc( "reg_page3" );
//-- [END] Go

break;

-------------------------------------------------------
-------------------------------------------------------

Thanks tom for pointing me on the right direction!

Thank you for your contribution!