Do you have ROM manager? You can download a P3 kernel right from there under the Cyanogen section. If not you can dowload one here and intall it from your sd card P3Droid Kernels
The slots are determined by the kernel you download. I'm a little confused. In your original post you wanted 5 screens now you are asking about 5 slots. Can you clarify so we can help, please.
If you are looking for 5 screens you would have to use a 3rd party launcher like helix. There are a bunch of them out there so you would have to try them out and see which one you like.