I’d really like to see input machines - but don’t think it is possible as the inputs do not appear to be pre filter, a shame IMHO.
Midi machines just like the MD, to allow other drum sounds/modules to be sequenced from the Rytm.
Clock/Pulse machines for modular pinging.
Sampling RAM machines, like the UW, simple and capable or resampling. Bit instead of a separate play and record machine, have it on the same machine, and a p-lock button for record and another p-lock button for play.