There is nothing technically wrong with using the kill switch. The comparison to shutting down a computer is a myth. If you remember, all computers used to be shut down that way. Only in today's more advanced operating systems do they require a shutdown sequence. The Roc's ECU is not running an advanced operating system.
I would offer, however, a difference method of shutdown than the kill switch. My preferred method is to use the sidestand switch for several reasons. 1) You never forget to put the sidestand down and suffer the embarrasment of having the bike fall on top of you, and 2) you leave the bike in gear so that it doesn't roll off the sidestand that you didn't forget to put down in the first place.
Easy sequence: 1) Sidestand down. 2) turn key off and remove.