And your opinion on the specifics of the proposed lift test are? Is 150lbs too much yet? Should it be proportional to body weight?
I would use 150lbs as the absolute upper limit because I know most agencies will give up provider safety for economics.
In the interest of provider safety, I would suggest capping it at 100lbs to the waist. (Not because I think people can't lift 150lbs, but I am aware of the degenerative damage over time and think it is better to overestimate the need for extra resources than to figure out after somebody is hurt that it would have been a good idea.)