On the hardware version, you can change the length of the pattern produced by the "pattern" setting in arpeggiator, by adjusting the machine's sequence length using the "last step" function.
Minifreak V, meanwhile, has a last step function, but you cannot use it to change the length of the arpeggiator "pattern" setting. Instead, you are only able to create patterns of exactly seventeen notes. (Supposed to be 16, but there is a bug making it 17!)
It would be EXTREMELY convenient for us to be able to change that length the same way you do on hardware, using "last step". (I.e. the orange moveable line on the sequencer display.)