Ehab,
You are right---a big "IF".....
I've got a set of spring guages here at work that I might just try on these digitals. These spring guages are the type used to set the amount of spring tension on a roller. You just pull the guage until the roller (or in this case---the servo) moves and then look at the scale. The tricky part is where to measure on the servo arm. I would be willing to bet that the manufacturers use the inner most hole on the servo arm/wheel to get the best published torque figures. It sure would be nice to have a set standard---say 1/2" or 3/4" out from the center of the servo arm/wheel. That way we could we could have a set standard for us to go by. The spring guage technique is probably not all that scientific but if you test every servo the same way you will at least get an idea of how one servo rates to another regarding equal published torque figures. I will also need a constant voltage DC power supply to ensure that every servo is tested at the same voltage and a dial indicator to measure when the servo deflects. Anyone want to give me a grant to perform this study?!?