i had thought of that,and actually tried it to see what would happen(i got it to move,but not at the proper rate).the thing i didn't like about it is that there is one spring on each side of the suspension arm,creating a balanced load.with only one,there is a torque load on the arm,which may or may not be a problem.
in any case,i have already completed cutting the springs and reinsalling them,and am happy with the results.as it is now,the suspension has settled about half way between the full extension and ride height position,and if i jump on the rear frame it goes pretty close to ride height.this gives room for the other things that need to go on still(gas tank,battery,body,etc)and if it's too soft i can shim for more preload.