So this is the V2 of Autotheory, and we're still lacking those most basic features :
- Save presets (not save as, the basic save, like in "overwrite")
- Undo and History
- A lock button next to the Steps / Accidental / Octave Rows so that those parameters are kept when switching from one play mode to the the other (relative scale to dynamic scale for instance)
- A "save as scale" feature based on the accidentals of the current degree that will be listed in the scale selector, thus becoming transposable
- More than one octave amplitude in the chord editor
- Modal transposition for each scale system (simple diatonic shifting of current scale, associated with a third drop down menu next to the scale selector)
- Chord/Scale system (for any given scale degree, associate a different scale from the scale list)
- a VST.
ChordScalePlaya (http://www.chordspace.com/Playa/Manual/Midi.htm) which achieve basically the same thing managed to do it. I'm sure you can do it too.