Options for transposing (via arp or per-track transpose) within chosen scale & key, as I described here
A dedicated 17th track where, as on the AR, you can p-lock (and, ideally, have at least 1 LFO to modulate) the parameters of each send effect, the compressor, the master overdrive, etc.
Pattern direct jump
Midi arp
Parameter slides
Third LFO for MIDI tracks
Option to force incoming MIDI notes to selected scale+key (related to first feature request)