I cut blocks all the time. Usually to make those older brackets in colors that you can never find. So I just custom cut them, and glue them together with PVC glue to make the bracket.
I would only recommend cutting the blocks using ~~~friction~~~. A bench grinder/sander works great for this. It sits in place on its own, which leaves your hands free to manipulate the brick as you cut it. This should help prevent you from losing a finger, but you can end up with some nasty rug-burns if you let your skin touch the wheel.
I would never even think about using any type of "toothed" cutting tool, like a saw, to cut your bricks. It will only result in them either flying across the room, or ripping the plastic beyond the area of what you actually want to cut. By cutting with friction you are actually melting away the plastic, so it leaves you with a nice semi-smooth cut that you just buff-out with a cloth wheel. It will look almost like a new at the area you cut if you buff it correctly afterwards.
I make all of my jigs, cutting templates, and supporting blocks for the cuts out of Mega Bloks. Once completed, more Mega Bloks are sacrificed to prove that the cut and subsequent gluing will yield the desired result. After the Mega Bloks prototype has proven my design and passed quality my control inspection for strength and stability, it is then thrown away and Legos are loaded into the Mega Bloks jig to be cut/glued.
Once your new custom part is completed and removed from your Mega Bloks jig, the only thing left to do is to go show the new custom block to your woman (who will politely smile at you for your efforts and all the while not care about it), grab a beer from the fridge, and then sit down on the couch and admire the new part you created as you twirl it around in your fingers. Mission accomplished.