Can I 'toe in' these cantilever brake pads? I'm riding a new bike (new to me) and I am unfamiliar riding with some of the components, specifically the cantilever cross brakes.  On my road bike, I toe in the brake pads to help with noise, feel, modulation, etc.

On this bike, the brake pads contact the rim pretty much evenly and don't have much modulation.  They are making a fair amount of noise right now.  I've done the obvious things to fix this besides toeing in the pads.  However, they don't really sit in and tilt around slightly on a rounded bushing when loosened like on normal road calipers, allowing for toeing in.

Is it possible to toe in the pads on these brakes? If so, how?
You could try replacing your current pads with a set that come with double conical washers. It sounds, and looks, like this set of pads doesn't have them, but there appears to be enough space for you to install them.

The washers come in pairs, one concave and one convex, with enough "slop" to allow them to sit at an angle as the pad mounting screw passes through. Each pad would have two pair of the washers, one pair on either side of the brake arm.