A system (210; 520; 624; 2172; 2804) for delivering sub-perception modulation to targeted neural tissue that includes dorsal horn tissue or dorsal root tissue, comprising: an arrangement of electrodes (211; 311-1 to 311-N; 511; 631; E1 to E16; 1044; 1144; 2173; 2805; 2920; 3226) configured to be operationally positioned for use in modulating the targeted neural tissue; a neural modulator (212; 312; 626; 629; 726; 2174; 2806; 2919; 3227; 3545) configured to use active electrodes within the arrangement of electrodes (211; 311-1 to 311-N; 511; 631; E1 to E16; 1044; 1144; 2173; 2805; 2920; 3226) to generate a sub-perception_modulation field, wherein the active electrodes are less than all of electrodes within the arrangement of electrodes (211; 311-1 to 311-N; 511; 631; E1 to E16; 1044; 1144; 2173; 2805; 2920; 3226); a communication module configured to receive user-provided selections; and a controller (2175; 2808; 3229; 3546) configured to: use the communication module to receive a user-provided selection of a desired active electrode list that identifies the active electrodes within the arrangement of electrodes (211; 311-1 to 311-N; 511; 631; E1 to E16; 1044; 1144; 2173; 2805; 2920; 3226)for use in delivering sub-perception modulation to the targeted neural tissue; and control the neural stimulation modulator (212; 312; 626; 629; 726; 2174; 2806; 2919; 3227; 3545) to deliver the sub-perception modulation field using a modulation parameter set to promote uniformity of the sub-perception modulation field within the targeted tissue using the active electrodes identified in the active electrode list, wherein the delivered sub-perception modulation using the desired active electrode list is therapeutically effective and uses less power than would be used to deliver sub-perception modulation using all of the electrodes within the arrangement of electrodes (211; 311-1 to 311-N; 511; 631; E1 to E16; 1044; 1144; 2173; 2805; 2920; 3226). an arrangement of electrodes (211; 311-1 to 311-N; 511; 631; E1 to E16; 1044; 1144; 2173; 2805; 2920; 3226) configured to be operationally positioned for use in modulating the targeted neural tissue; a neural modulator (212; 312; 626; 629; 726; 2174; 2806; 2919; 3227; 3545) configured to use active electrodes within the arrangement of electrodes (211; 311-1 to 311-N; 511; 631; E1 to E16; 1044; 1144; 2173; 2805; 2920; 3226) to generate a sub-perception_modulation field, wherein the active electrodes are less than all of electrodes within the arrangement of electrodes (211; 311-1 to 311-N; 511; 631; E1 to E16; 1044; 1144; 2173; 2805; 2920; 3226); a communication module configured to receive user-provided selections; and a controller (2175; 2808; 3229; 3546) configured to: use the communication module to receive a user-provided selection of a desired active electrode list that identifies the active electrodes within the arrangement of electrodes (211; 311-1 to 311-N; 511; 631; E1 to E16; 1044; 1144; 2173; 2805; 2920; 3226)for use in delivering sub-perception modulation to the targeted neural tissue; and control the neural stimulation modulator (212; 312; 626; 629; 726; 2174; 2806; 2919; 3227; 3545) to deliver the sub-perception modulation field using a modulation parameter set to promote uniformity of the sub-perception modulation field within the targeted tissue using the active electrodes identified in the active electrode list, wherein the delivered sub-perception modulation using the desired active electrode list is therapeutically effective and uses less power than would be used to deliver sub-perception modulation using all of the electrodes within the arrangement of electrodes (211; 311-1 to 311-N; 511; 631; E1 to E16; 1044; 1144; 2173; 2805; 2920; 3226). use the communication module to receive a user-provided selection of a desired active electrode list that identifies the active electrodes within the arrangement of electrodes (211; 311-1 to 311-N; 511; 631; E1 to E16; 1044; 1144; 2173; 2805; 2920; 3226)for use in delivering sub-perception modulation to the targeted neural tissue; and control the neural stimulation modulator (212; 312; 626; 629; 726; 2174; 2806; 2919; 3227; 3545) to deliver the sub-perception modulation field using a modulation parameter set to promote uniformity of the sub-perception modulation field within the targeted tissue using the active electrodes identified in the active electrode list, wherein the delivered sub-perception modulation using the desired active electrode list is therapeutically effective and uses less power than would be used to deliver sub-perception modulation using all of the electrodes within the arrangement of electrodes (211; 311-1 to 311-N; 511; 631; E1 to E16; 1044; 1144; 2173; 2805; 2920; 3226).