3G 4.0 jailbroken but all apps multitasking?

[Reptar]

I just jailbroke my 3G and enabled apples way of multitasking. I noticed when I open apps that haven't been updated in months are multitasking. I thought only update apps that supported 4.0 can only multitask?
I don't want non updated 4.0 apps multitasking on hogging my little ram. I know I can close those apps but I just don't want them to multitask at all.

Also does having a background image slow down the phone? Is that why apple didn't allow the 3G to have background image?

 

[big9erfan]

They aren't multi-tasking, they are closing, the task bar is also used like a "recently used" list, so "quickly" access apps. The apps have to be updated to take advantage of multitasking. If they haven't been updated, they close just like they used to.

 

[Reptar]

Ohhh. I was wondering why apps like Camera was multitasking. Thanks I understand that they aren't multitasking. Thats really cool how its like a recent list.

Another question that doesn't have to do with jailbreaking:
I don't want a background image on my homescreen some times. How do i take it off?