What precisely do you mean by loose? On all of mine they just sit there in place until actuated by an empty mag.
All of the force that pushes the paddle outwards comes from the magazine spring after being transferred through multiple other components, so there's quite a bit of lost energy in the system. The force required to press on the paddle upon completion of a reload is less than any GBBR of course, but (at least from what I've always been told) a good bit more than on any PTW or equivalent.
I don't think you'd ever get near the 'feel' of a GBB bolt release by sheer nature of the system, but to increase the force required to depress the paddle you'd either need some monster of a magazine spring (which I think would be detrimental to the gun in other respects) or another spring added in to the system. Either directly behind the paddle or acting on one of the other parts, but you'd have to counter that force by also increasing the strength of whatever holds the paddle in the standard vertical position for firing, otherwise it'd just stick out all of the time.