When looking at this compared with some other products available (as well as your own Vox Continental V), and to allow this instrument to manage the more rock-end of sounds (Jon Lord style), there are a few things which I believe are needed:
1. Bass pedals (as per other question, and due hopefully soon)
2. More options for Leslie cabinets
3. Options for amplifiers - especially allowing distorted overdrive on them (not just the overdrive pedal)
4. Options for non-Leslie speakers to go with the amps
5. Traditional half-moon controls for the Leslie
6. Options to change effects/routing in the effects board, and more effects available