Yes it can be done, replace the side links of the 3pt hitch with longer than normal hydraulic side links. Not advisable though, the internal lift stops are not made to take the kind of stresses that could be put on them.
The problem with putting down pressure on the implement based on the weight of the tractor is that you now lose traction. You can put all the weight of the tractor on the implement, but now with the rear tires in the air, what are you going to pull all that weight with, the fronts? NOT A GOOD IDEA.
It is best to have an implement that is built with heavy material, that way the implement itself can withstand all of the stresses put on it because of the weight. A lightweight implement that has weight added to it will eventually fail. They just are not structurally built to take the stress that can occur from the additional weight.