Macbook Pro (Unibody): Trackpad requires too much force
Yes, the physical spring action of the button as well as the springs at the top of the trackpad that connect it to the unibody are adjustable and/or replaceable.

The parts are delicate and the set screw notoriously hard for beginning technicians to work on - even with official Apple parts and training.

I'd take it to Apple and if it is indeed different than the floor models in terms of force, you should be in great hands with them adjusting or repairing the hardware if it's not properly aligned or some foreign substance has worked itself into the gaps where the trackpad needs space to move.