If i understand you correctly, you are saying remove the magnetic return grub screw, but that just seems too easy. Is there no way to remove the magnet completely?
you dont need to remove the circular magnet that is located in the frame.
Of course, if you REALLY wanted to, you could, but there is absolutely no difference to just removing the grub screw as it serves the same purpose.
if you are using an 05 ego, i dont recommend you remove the screw however, seeing as there will be no return at all on the trigger pull and will cause massive amounts of bounce.
alternatively, if you are feeling adventurous, there are documented methods for adding spring return to a stock 05 frame (by means of a disassembled Biro, and a small amount of drilling i think) which would afford you a nicer trigger action.
Have fun with it.