Electrical stimulation therapy is provided for a patient. A user is informed that a user-supplied electrical stimulation waveform can be entered into an electronic programmer. At least in part via a user interface of the electronic programmer, it is detected that the user-supplied electrical stimulation waveform has been received by the electronic programmer. A determination is made to whether the user-supplied electrical stimulation waveform is compliant with a set of predetermined restrictions. In response to a determination that the user-supplied electrical stimulation waveform is compliant with the set of predetermined restrictions, a pulse generator is instructed to generate electrical stimulation pulses based on the user-supplied electrical stimulation waveform.