[AlexanderT]

Hack (1.1 / 1.2?) needs 2 fixes (one bug mentioned by eXtremeTim). Thanks to Zachery for this nice hack :P
Edit: FIX FIXED

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FIX 1 (no more option resets)

- Open file includes/functions_user.php

Find:
-----

PHP Code:

// check extra profile fields
    $profilefields = $DB_site->query("
        SELECT profilefieldid,required,title,size,maxlength,type,data,optional, regex
        FROM " . TABLE_PREFIX . "profilefield
        WHERE editable = 1
            AND form " . iif($formtype, '>= 1', '= 0'). "
    "); 


REPLACE with:
-------------

PHP Code:

// vB currently only uses $formtype=0(profile form 0) or $formtype=1(all options (form 1 to 5))
    if ($formtype >= 1 and $formtype <=5) {
        $typestart = 1;
        $typeend = 5;
    }
    // formtype is either 0(profile) or our extra page
    else $typestart = $typeend = $formtype;

    // check extra profile fields
    $profilefields = $DB_site->query("
        SELECT profilefieldid,required,title,size,maxlength,type,data,optional, regex
        FROM " . TABLE_PREFIX . "profilefield
        WHERE editable = 1
            AND (form >= $typestart)
            AND (form <= $typeend)
    "); 


- Open file profile.php

Find:
----

PHP Code:

if ($_POST['do'] == 'updateextra')
{ 
    $userfields = verify_profilefields(1); 


REPLACE with:
-------------

PHP Code:

if ($_POST['do'] == 'updateextra')
{ 
    $userfields = verify_profilefields(6); 


-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
FIX 2 (Cache templates)

- Open file profile.php

Find:
-----

PHP Code:

'removelist' => array(
        'modifylist_removeuser',
    ), 


BELOW it add:
-------------

PHP Code:

'extra' => array(
        'page',
        'modifyoptions_timezone',
        'userfield_checkbox_option',
        'userfield_optional_input',
        'userfield_radio',
        'userfield_radio_option',
        'userfield_select',
        'userfield_select_option',
        'userfield_select_multiple',
        'userfield_textarea',
        'userfield_textbox',
    ),