It does sound like a firmware change to be able to do it with a single unit, not sure on what options they have available in the unit but it could be possible to have the sequencer work in 'pages' each page controlling a different parameter.
e.g Page 1 Note On/Off, Page 2 Note Length, Page 3+ Assignable CC's
Of course paging isn't ideal as a user interface, plus if the knobs are not continuous encoders you have the problem of them not being in the correct position when you switch pages.
If the sequencer had a choice of Note or CC's , you could then run multiple units giving a better interface as all controls are available at the same time, but this would mean adding the ability to sync multiple units.
I am contemplating getting one of these for use with iPad and iMini. iMS-20 and Gadget, but the current limitations (No individual step length and no CC sequencing) are putting me off. It's current form does not suit any of the above perfectly, but is better value than the Novation LaunchControl as it does have at least a basic sequencer and more solid build quality.
However, if all you want is a controller, for similar money you could get 2 Korg NanoKontrol2's with faders giving an equivalient 16 controls (plus lots of on/off buttons) but with faders, which give better visual feedback than rotaries