Just found out that the >clear< key on the extended Mac keyboard zooms in to center your work on the working layer. The >home< takes you back out to full working layer. So if you need to go in and out of a close view... draw on a separate layer with vector dots spaced apart on your layer to set how ...

Or... if you have Quicktime Pro you can copy and paste all your clips together, if you saved them as quicktime movies.