Big post, lost of copypasta from all over. I'm not referencing it due to the amount of places, and it's just forum talk from years ago across the interwebs.
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I remember converting mine and my friends' coaster brakes to "un-brakes" using 4 big washers and the spring out of a Sturmey Archer 3 speed hub. You would pull out the brake shoes and install the spring with 2 washers on each side of it. Most of us had coaster brake equipped Tuffs and MX-60's, a couple of guys had Motomags and a few had Femco heavy duty rims.
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The replacement of internal brake pads with a spring and two washers was done way before freestyle took hold. It was a cheap way of getting a "freewheel" for many a kid who could not afford a new wheel. Tom DeRosier (among many others) was doing way back in 75 or so.
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Most coaster brakes have a cone shaped wedge that rides on a treaded carrier attached to the sprocket. When you pedal forward the wedge moves to the right to engage the hub. When you pedal in reverse the wedge is driven to the left to engage the brake mechanism. If you remove the brake parts and replace them with a spacer to hold the wedge in place, it should work fine. Use a stack of washers or a piece of PVC pipe for a spacer. That's definitely easier than replacing the wheel.
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Technically, there once was a product called "Un-Brake" which replaced the brake shoe with a spacer. (the spacer needs to replicate the brake shoe dimansions and tabs so the retarder and clutch will still work)
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Here's a pictorial i once made about modifying a Suntour coaster hub (in Peregrine mags) to a free-coaster using the un-brake: *SEE LINK FOR PICS*
http://www.vintagebmx.com/community/lofiversion/index.php/t3010880.html
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So, this was a 20 minute Google search with the same coaster brake conversion search terms, but with "un-brake" added to them! I'm going to leave the first ones I found and finish with the last one - seems like we're missing a part when we're just pulling out the brake shoes!
