When Apple introduced multitasking into their iOS platform, millions of iDevice users rejoiced. Although it was a bit of a struggle at first, as soon as developers started updating their apps to support multitasking, it became a really useful feature.
But as with most things Apple, what you see is what you get. There is no stock option to customize this multitasking bar. But luckily for us jailbroken folk, there's an answer. MySwitcher from BigBoss is available in Cydia and is more than up to the task of customizing your multitask bar...