Switching from the D430 default of "PS2 kext: NAV/Slice Merged" to "PS2 ext: Apple's PS2controller" did the trick. I gained trackpoint control but lost side/bottom scroll. That is acceptable because I am accustomed to the blue trackpoint nub.
Is there an extension to enable the pointer-stick on Dell Dxxx devices? The track pad is sufficient but I have grown accustomed to using the pointer-stick.