For a chest lid, the only dial you need to see, or use, is the one that opens the lid. You can hide the dials that you don't need. In the pp2 use a '1'  as the value in the 'hidden' line:

        translateY ytran
            {
            name ytran
            initValue 0
            hidden 1
            forceLimits 1
            min 0
            max 0
            trackingScale 0.001
            keys
                {
                static  0
                k  0  0
                }
            interpStyleLocked 0
            trackingScaleMult 1.000000
            }

Hiding dials is optional, you don't have to do it. Poser itself does not provide a way to hide dials, but you can use Snarlygribbly's Scene Fixer to hid dials from within Poser. As Scene Fixer is a python script I think it should work on a Mac. If you hide a dial, it's usually best to force its limits to some set value to also prevent the channel being affected via the mouse. For hidden translation and rotation channels you will usually want to force the Min and Max to zero, for hidden scale channels Min and Max values should usually be 1.0 (=100%).

You can edit the display name of a dial, but Poser does not provide a way to edit the dial name,  you need to edit the pp2 file itself.

        rotateX xrot
            {
            name Open-Close
            initValue 0
            hidden 0
            forceLimits 1
            min 0.000
            max 45.000
            trackingScale 1
            keys
                {
                static  0
                k  0  0
                }
            interpStyleLocked 0
            }