Modulation of the oscillator controls using a LFO with the standard waveforms is a bit limited. Custom waveforms can now be loaded into the LFOs to break those limitations and provide fully controllable LFO modulation. When you use the wavetable creator you can build a library of waveforms for building wavetables, and now those waveforms can be used as a modulation waveform.
To load a custom waveform, use the waveform icon on the LFO module and this will bring up your library of waveforms. If you have not saved any waveforms yet, start building a collection using the wavetable creator tool.