Super Chop Saw Stop
This stop slides along a rail that's screwed to the top of my chop saw fence, and I can lock it in any position. The hinged block is locked in the down position with a trunk latch. When not needed, the stop can be flipped up out of the way or removed altogether. The miter attachment is quickly installed with a single bolt and two wooden locking pins keep it from swiveling.
A stop is the way to go for cutting multiple parts at exactly the same length. This is definitely a step up from just clamping a block to the fence. I especially like the home-made T-track. One thing I don't see is how the block would stay in the "up" position. I guess I'd maybe add a hook or catch of some sort on the front edge.