not really, unless it is a bunch of them adding potential surfaces that may oxidize in time. Ground is ground.
If you're adding grounds to auxiliary equipment, I recommend crimping the wired into an eyelet, then fastening that with the grounding crew or bolt. Do this, instead of twisted the copper wire around the shaft of said screw.
But if you had like 10 wires on one ground, I would combine some of those wires into a smaller number of eyelets. The factory did this. I have not seen more than 3 wires per ground, though.