Why not get a saw that get's it close, and use one of those trimmer thingys to fine tune the cut to perfection?
Something like this maybee... http://grizzly.com/products/G1690
If precision is what you are looking for, I'd guess thats why they use this type of thing for picture frames. The only problem is if it doesn't work with the height of the molding you are looking for...
Programmer - An organism that turns coffee into software.
If all your friends are exactly like you, What an un-interesting life it must be.
"A door is what a dog is perpetually on the wrong side of" Ogden Nash