Both your questions relate to features of the desktop version of KeePass which I duplicated in the BlackBerry version.
"6000" is the number of rounds of key encryption. Basically, your password is cyclicly encrypted 6000 times as a security measure before being used to decrypt or encrypt the database. On the desktop, the 6000 rounds happens so fast you don't even notice it but on the handheld it does take a while. You could shorten the number but it MUST be the same on both the desktop and handheld versions of the database.
Keyfiles are a feature of the desktop version of KeePass that don't really make sense for the BlackBerry version but have to be there to provide compatability. A keyfile is a file that's used either in conjunction with, or instead of a password. The content of the keyfile can be anything but you must physically secure the file. The original intent was that you place the keyfile on a USB stick or other media that you can remove from the PC. That doesn't really translate well to a handheld paradigm but I had to include the capability or those that use keyfiles on the desktop wouldn't be able to use KeePassBB.
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