Select groups (OPTGROUP)

Greetings,

Am I right that activeselect module doesn't support groups (OPTGROUP)?

Can I create the structure like this one to specify that items should created within an OPTGROUP:
'target-name-2' => array(
'options' => array(
'group1' => array(
'value' => array(
'opt-val-3' => array(
'value' => 'opt-text-3',
'selected' => FALSE
)
)
),

Thanks for your help.