Another cool benefit to running a bladder shock and using the bleed screw to adjust the rebound, based on how far you push the shock shaft in, is that you can easily adjust your rebound without having to add or remove oil. You could effectively build a set of shocks, set to full rebound. Mount them on your car such that you can easily reach the bleeder screws without removing the shocks. Run the car at full rebound first. Get a feel. Come into the pits. Have a buddy remove the bleed screw, push the shock all the way in, replacing the bleed screw. Repeat for all four shocks.

Now you can quickly compare full rebound to full pull back on one tank of fuel or single battery.