I modified my Weinmann front caliper with a home-made booster brace, a super-short straddle cable, and cord straps to keep the pads level during steep, off-road descents.

The lower picture is of my Dura-ace centerpull's levers with modified hoods, since Shimano didn't offer hoods with the safety-lever option.
The big, fat screw head rotates with lever movement, so the hood is cut for clearance.
The inside pivot assembly in these levers is a bag of tricks, and the entire pivot had to be removed to install the modified hoods.