Shoutbox

I assume you want them to popup instead of appearing minimized on taskbar. To alter that you can edit the registry yourself or use Plus!Tweak wich you can find here: http://msgplus.net/help_registry.php

Regkey:
HKCU\Software\Patchou\MsgPlus2\your@email.com\Preferences
ShowNotMinimised
dword 0

Boolean value. If true (1), new chat windows are not displayed minimised when they are created.