Question About Shared Memory

So I know the video card shares memory from the main memory...

Can I allocate it more than 64mb? I have 2GB's now and I'd really love to if I could.

Although I think I know the answer to this already =(

Unfortunately, no. Though to be honest, adding more memory to the integrated chipset really won't add any performance. The only thing that will happen is that you'll have less RAM to use

yea it looks like OSX is pretty good about taking what it needs from the memory for the video stuff.

no real need to manually manage

You can't do memory management. That is completely dependent upon system needs/resources. What you can do is change the CPU clock rate to a certain threshold, but that won't do you any good as far as video graphics.