1. A system for an electrical tissue stimulator coupled to an array of electrodes, comprising: processor-readable memory that stores a stimulation programming package; and at least one processor that, when executing the stimulation programming package, is configured for generating a programming screen that comprises a stimulation field representation window and a control window that is separate and distinct from the stimulation field representation window, wherein the control window comprises at least two axial displacement control elements and actuation of a single one of the at least two axial displacement control elements generates an axial displacement control signal, wherein the at least two axial displacement control elements comprises a proximal displacement control element and a distal displacement control element, wherein actuation of the proximal displacement control element axially shifts electrical current between the electrodes in a proximal direction to modify a region of tissue activation and actuation of the distal displacement control element axially shifts the electrical current between the electrodes in a distal direction to modify the region of tissue activation; and wherein the at least one processor, when executing the stimulation programming package, is further configured for generating a stimulation parameter set in response to the axial displacement control signal generated by the actuation of the single one of the at least two axial displacement control elements that, when applied to the electrodes, will axially shift the electrical current between the electrodes, in response to the actuation of the single one of the at least two axial displacement control elements, to modify the region of tissue activation, and the at least one processor, when executing the stimulation programming package, is further configured for computing an estimate of the modified region of tissue activation, and for generating display signals capable of prompting a monitor to display, in the stimulation field representation window, an animated graphical representation of a shift of the region of tissue activation to the computed estimate of the modified region of tissue activation such that a viewer perceives the shift as movement, in a continuous or flickering manner, of the region of tissue acitivation through a series of intermediate depictions to the computed estimate of the modified region of tissue activation.