Need at least - Sustain and Expression (volume) for pedals (control).
That one does not have that that you listed. You get more if you pay more.
Look up the manual at the Akai website. It may have Expression (I am not sure I looked at several now), but the more expensive ones have both - Sustain and Expression (volume is what I use with my Roland).
Besides that, well, different things for different folks I guess.
I get more keys length on the keyboard also - at least 61 keys (which also can get short after awhile.) I like to jump around, so my 76 Juno Stage is just about right - not full 88 keyboard - but enough to make it a bit smaller. Some people would want a full size piano keyboard - 88 keys. Until you hit those low notes and those very high notes without having to change the octave down or up on the keyboard, it may help. Not everything is midrange, but a full size keyboard probably is not needed.
Afterall most instruments do not play in that entire range either, and will sound like it if trying to place too high or too low a note on a keyboard. Afterall, it is all in the sense - pseudo instruments.