No, there is nothing you can do about the time it takes your BB to boot up.
There is something about the TIME your BB reboots though.
Download and install QuickPull, a free app that allows you to schedule your BB to reset/reboot at a specified time. So you can set it to reboot every night when you are sleeping if you like.
Posted from my CrackBerry at wapforums.crackberry.com